{"title":"Black Iron Fittings","description":"\u003cp\u003eBlack malleable iron threaded fittings for gas, steam, compressed air and hydronic heating. Sizes 1\/8\" through 4\", in FIP, MPT x FPT, three-way FPT and flanged configurations.\u003c\/p\u003e\u003cp\u003eBlack iron is used on gas because it carries no zinc. Zinc coating can shed inside a fuel gas line and the flakes foul controls and orifices downstream, which is why black is the trade default even though a galvanized fitting looks identical on the shelf. NFPA 54 does permit galvanized steel pipe for fuel gas, so the requirement on any given job comes from the local code and the gas utility rather than from a blanket ban.\u003c\/p\u003e\u003cp\u003eThreads are NPT and taper — the seal comes from thread deformation, not from the sealant, so the correct engagement depth matters more than how much dope is applied. Use a sealant rated for the medium: standard pipe dope is not approved for gas, where a yellow gas-rated PTFE tape or a listed compound is required.\u003c\/p\u003e\u003cp\u003eTees, couplings, 90° elbows and street elbows, bushings, caps and plugs make up the range.\u003c\/p\u003e\u003cp\u003ePredominantly Mueller Streamline.\u003c\/p\u003e\u003cp\u003eThread engagement figures, Class 150 pressure ratings and Schedule 40 pipe dimensions are collected in our \u003ca href=\"\/pages\/black-iron-pipe-fittings-specs\"\u003eblack iron reference guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eBlack iron fittings by size: Mueller Streamline part numbers\u003c\/h2\u003e\u003cp\u003eThe most-ordered Mueller Streamline black malleable iron fittings, by size and type. Each part number links to the product page. Reducing tees, reducing couplings, bushings, 45° street elbows and floor flanges are in the full collection below.\u003c\/p\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eSize\u003c\/th\u003e\n\u003cth scope=\"col\"\u003e90° Elbow\u003c\/th\u003e\n\u003cth scope=\"col\"\u003e45° Elbow\u003c\/th\u003e\n\u003cth scope=\"col\"\u003e90° Street Elbow\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eTee\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eCoupling\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eUnion\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eCap\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePlug\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e1\/2\"\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-black-iron-elbow-90\"\u003e520-003\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-black-iron-elbow-45\"\u003e520-203\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-black-iron-elbow-90-street\"\u003e520-303\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-black-iron-tee\"\u003e520-603\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-black-iron-coupling\"\u003e521-203\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-black-iron-union\"\u003e521-703\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-black-iron-cap\"\u003e521-403\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-2-black-iron-plug\"\u003e521-803\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e3\/4\"\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-black-iron-elbow-90\"\u003e520-004\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-black-iron-elbow-45\"\u003e520-204\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-black-iron-elbow-90-street\"\u003e520-304\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-black-iron-tee\"\u003e520-604\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-black-iron-coupling\"\u003e521-204\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-black-iron-union\"\u003e521-704\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-black-iron-cap\"\u003e521-404\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/3-4-black-iron-plug\"\u003e521-804\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e1\"\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-black-iron-elbow-90\"\u003e520-005\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-black-iron-elbow-45\"\u003e520-205\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-black-iron-elbow-90-street\"\u003e520-305\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-black-iron-tee\"\u003e520-605\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-black-iron-coupling\"\u003e521-205\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-black-iron-union\"\u003e521-705\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-black-iron-cap\"\u003e521-405\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-black-iron-plug\"\u003e521-805\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e1-1\/4\"\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-black-iron-elbow-90\"\u003e520-006\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-black-iron-elbow-45\"\u003e520-206\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-black-iron-elbow-90-street\"\u003e520-306\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-black-iron-tee\"\u003e520-606\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-black-iron-coupling\"\u003e521-206\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-black-iron-union\"\u003e521-706\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-black-iron-cap\"\u003e521-406\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-4-black-iron-plug\"\u003e521-806\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e1-1\/2\"\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-black-iron-elbow-90\"\u003e520-007\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-black-iron-elbow-45\"\u003e520-207\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-black-iron-elbow-90-street\"\u003e520-307\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-black-iron-tee\"\u003e520-607\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-black-iron-coupling\"\u003e521-207\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-black-iron-union\"\u003e521-707\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-black-iron-cap\"\u003e521-407\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/1-1-2-black-iron-plug\"\u003e521-807\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e2\"\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-black-iron-elbow-90\"\u003e520-008\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-black-iron-elbow-45\"\u003e520-208\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-black-iron-elbow-90-street\"\u003e520-308\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-black-iron-tee\"\u003e520-608\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-black-iron-coupling\"\u003e521-208\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-black-iron-union\"\u003e521-708\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-black-iron-cap\"\u003e521-408\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-black-iron-plug\"\u003e521-808\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-pipe\"\u003eblack iron pipe\u003c\/a\u003e and \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eFor 2\" and larger steel pipe in fire protection and HVAC risers, \u003ca href=\"\/collections\/gruvlok-fittings\"\u003eGruvlok grooved fittings and couplings\u003c\/a\u003e join pipe without threading or welding.\u003c\/p\u003e","products":[{"product_id":"1-2-x-3-8-black-iron-union","title":"BrassCraft 42-8-6 1\/2\" x 3\/8\" Black Iron Union","description":"\u003cp\u003eBrassCraft 42-8-6 is a 1\/2\" x 3\/8\" Black Iron Union.\u003c\/p\u003e\u003cp\u003eA union joins two threaded pipes and can later be taken apart without turning the pipe, which makes it useful where equipment or a section of line may need to be removed for service. This reducing union connects two different pipe sizes. Confirm both pipe sizes, the thread type, and that black iron is approved for the application under local code before installing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e BrassCraft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 42-8-6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.13 lb\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/brasscraft\"\u003eBrassCraft\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-fittings\"\u003eBlack Iron Fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/brass-fittings\"\u003eBrass Fittings\u003c\/a\u003e.\u003c\/p\u003e","brand":"BrassCraft","offers":[{"title":"Default Title","offer_id":44350356095079,"sku":"FLAR-050.038-UNI","price":5.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_UNI_81.jpg?v=1785802944"},{"product_id":"1-8-black-iron-elbow-45","title":"Mueller Streamline 520-200 1\/8\" Black Iron Elbow - 45°","description":"\u003cp\u003eMueller Streamline 520-200 is a 1\/8\" elbow 45° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 45° elbow makes a gentle change of direction; two of them offset a line around an obstacle.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 45°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370227\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.48 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043240039,"sku":"BLIF-018-45EL","price":3.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_045_101.jpg?v=1785812099"},{"product_id":"1-8-black-iron-elbow-90","title":"Mueller Streamline 520-000 1\/8\" Black Iron Elbow - 90°","description":"\u003cp\u003eMueller Streamline 520-000 is a 1\/8\" elbow 90° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 90° elbow turns the line a quarter turn.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888369986\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.34 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043272807,"sku":"BLIF-018-90EL","price":2.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_19.jpg?v=1785812100"},{"product_id":"1-8-black-iron-cap","title":"Mueller Streamline 521-400 1\/8\" Black Iron Cap","description":"\u003cp\u003eMueller Streamline 521-400 is a 1\/8\" cap in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA cap closes off the end of a line, for a future connection or to hold pressure during a test.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Cap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371712\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.23 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043305575,"sku":"BLIF-018-CAP","price":2.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_CAP_30.jpg?v=1785812101"},{"product_id":"1-8-black-iron-coupling","title":"Mueller Streamline 521-200 1\/8\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-200 is a 1\/8\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371378\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.4 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043371111,"sku":"BLIF-018-CPL","price":3.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COUP_173.jpg?v=1785812103"},{"product_id":"1-8-black-iron-plug","title":"Mueller Streamline 521-800 1\/8\" Black Iron Plug","description":"\u003cp\u003eMueller Streamline 521-800 is a 1\/8\" plug in black malleable iron, MPT (MPT = male pipe thread).\u003c\/p\u003e\u003cp\u003eA plug threads into a female opening to close it.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-800\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371811\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.32 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043436647,"sku":"BLIF-018-PLG","price":1.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_PLG_49.jpg?v=1785812104"},{"product_id":"1-8-black-iron-elbow-90-street","title":"Mueller Streamline 520-300 1\/8\" Black Iron Elbow - 90° (Street)","description":"\u003cp\u003eMueller Streamline 520-300 is a 1\/8\" elbow 90° (street) in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA street elbow has one male threaded end, so it goes straight into another fitting without a separate piece of nipple, which makes the turn tighter and saves a joint.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90° (Street)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370296\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.46 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043469415,"sku":"BLIF-018-ST90","price":3.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_S_66.jpg?v=1785812105"},{"product_id":"1-8-black-iron-tee","title":"Mueller Streamline 520-600 1\/8\" Black Iron Tee","description":"\u003cp\u003eMueller Streamline 520-600 is a 1\/8\" tee in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA tee splits one line into two, or brings a branch into a run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-600\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Tee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370494\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.48 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043502183,"sku":"BLIF-018-TEE","price":3.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_TEE_S_159.jpg?v=1785812106"},{"product_id":"1-4-black-iron-elbow-45","title":"Mueller Streamline 520-201 1\/4\" Black Iron Elbow - 45°","description":"\u003cp\u003eMueller Streamline 520-201 is a 1\/4\" elbow 45° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 45° elbow makes a gentle change of direction; two of them offset a line around an obstacle.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-201\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 45°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370234\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.43 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043534951,"sku":"BLIF-025-45EL","price":3.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_045_101_c81c3b9f-9889-49ee-a7fd-5d206b225001.jpg?v=1785812107"},{"product_id":"1-4-black-iron-elbow-90","title":"Mueller Streamline 520-001 1\/4\" Black Iron Elbow - 90°","description":"\u003cp\u003eMueller Streamline 520-001 is a 1\/4\" elbow 90° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 90° elbow turns the line a quarter turn.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888369993\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.32 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043567719,"sku":"BLIF-025-90EL","price":2.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_19_c70c0221-8ec0-46cc-ba9b-987997c755d7.jpg?v=1785812109"},{"product_id":"1-4-black-iron-cap","title":"Mueller Streamline 521-401 1\/4\" Black Iron Cap","description":"\u003cp\u003eMueller Streamline 521-401 is a 1\/4\" cap in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA cap closes off the end of a line, for a future connection or to hold pressure during a test.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-401\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Cap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371729\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.29 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043633255,"sku":"BLIF-025-CAP","price":2.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_CAP_30_1dd21e42-85f4-4dff-9d2a-34c908376a35.jpg?v=1785812109"},{"product_id":"1-4-black-iron-coupling","title":"Mueller Streamline 521-201 1\/4\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-201 is a 1\/4\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-201\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371385\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.37 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043698791,"sku":"BLIF-025-CPL","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COUP_173_6f012abb-f37d-4469-99db-dff9489181f5.jpg?v=1785812111"},{"product_id":"1-4-black-iron-plug","title":"Mueller Streamline 521-801 1\/4\" Black Iron Plug","description":"\u003cp\u003eMueller Streamline 521-801 is a 1\/4\" plug in black malleable iron, MPT (MPT = male pipe thread).\u003c\/p\u003e\u003cp\u003eA plug threads into a female opening to close it.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-801\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371828\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.32 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043731559,"sku":"BLIF-025-PLG","price":1.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_PLG_49_18fc3aa7-9e1b-4f38-baca-a58ec49a3655.jpg?v=1785812112"},{"product_id":"1-4-black-iron-elbow-90-street","title":"Mueller Streamline 520-301 1\/4\" Black Iron Elbow - 90° (Street)","description":"\u003cp\u003eMueller Streamline 520-301 is a 1\/4\" elbow 90° (street) in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA street elbow has one male threaded end, so it goes straight into another fitting without a separate piece of nipple, which makes the turn tighter and saves a joint.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-301\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90° (Street)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888363465\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.44 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043764327,"sku":"BLIF-025-ST90","price":3.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_S_66_18217efc-921c-4deb-9314-4eb87c597856.jpg?v=1785812114"},{"product_id":"1-4-black-iron-tee","title":"Mueller Streamline 520-601 1\/4\" Black Iron Tee","description":"\u003cp\u003eMueller Streamline 520-601 is a 1\/4\" tee in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA tee splits one line into two, or brings a branch into a run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-601\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Tee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.42 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043797095,"sku":"BLIF-025-TEE","price":3.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_TEE_S_159_6e1a9f4d-a4ed-4744-833d-1aed07fa9402.jpg?v=1785812115"},{"product_id":"1-4-x-1-8-black-iron-bushing","title":"Mueller Streamline 521-910 1\/4\" x 1\/8\" Black Iron Bushing","description":"\u003cp\u003eMueller Streamline 521-910 is a 1\/4\" x 1\/8\" bushing in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA bushing threads into a larger female fitting to reduce it: male thread outside, smaller female thread inside.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-910\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\" x 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Bushing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371873\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.45 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043862631,"sku":"BLIF-025.018-BSH","price":3.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_BSH_219.jpg?v=1785812116"},{"product_id":"1-4-x-1-8-black-iron-coupling","title":"Mueller Streamline 521-310 1\/4\" x 1\/8\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-310 is a 1\/4\" x 1\/8\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-310\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\" x 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371477\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.35 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043928167,"sku":"BLIF-025.018-CPL","price":2.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COU_R_260.jpg?v=1785812117"},{"product_id":"3-8-black-iron-elbow-45","title":"Mueller Streamline 520-202 3\/8\" Black Iron Elbow - 45°","description":"\u003cp\u003eMueller Streamline 520-202 is a 3\/8\" elbow 45° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 45° elbow makes a gentle change of direction; two of them offset a line around an obstacle.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-202\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 45°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370241\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.43 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043960935,"sku":"BLIF-038-45EL","price":3.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_045_101_970ea913-8ad5-477b-a6d8-1a9e5c5cfb9c.jpg?v=1785812118"},{"product_id":"3-8-black-iron-elbow-90","title":"Mueller Streamline 520-002 3\/8\" Black Iron Elbow - 90°","description":"\u003cp\u003eMueller Streamline 520-002 is a 3\/8\" elbow 90° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 90° elbow turns the line a quarter turn.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-002\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.32 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351043993703,"sku":"BLIF-038-90EL","price":2.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_19_82a5974a-674b-4d93-a715-f5190424755d.jpg?v=1785812120"},{"product_id":"3-8-black-iron-cap","title":"Mueller Streamline 521-402 3\/8\" Black Iron Cap","description":"\u003cp\u003eMueller Streamline 521-402 is a 3\/8\" cap in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA cap closes off the end of a line, for a future connection or to hold pressure during a test.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-402\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Cap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371736\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.29 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044026471,"sku":"BLIF-038-CAP","price":2.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_CAP_30_772daaa3-4ff4-4cbc-b534-34bf89e926e4.jpg?v=1785812121"},{"product_id":"3-8-black-iron-coupling","title":"Mueller Streamline 521-202 3\/8\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-202 is a 3\/8\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-202\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371392\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.37 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044059239,"sku":"BLIF-038-CPL","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COUP_173_6f12cb7c-04b5-4e0e-8a9e-e3b5e11c21b7.jpg?v=1785812122"},{"product_id":"3-8-black-iron-plug","title":"Mueller Streamline 521-802 3\/8\" Black Iron Plug","description":"\u003cp\u003eMueller Streamline 521-802 is a 3\/8\" plug in black malleable iron, MPT (MPT = male pipe thread).\u003c\/p\u003e\u003cp\u003eA plug threads into a female opening to close it.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-802\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371835\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.32 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044092007,"sku":"BLIF-038-PLG","price":1.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_PLG_49_a12ebdad-22df-4961-81f6-70415ffc1108.jpg?v=1785812123"},{"product_id":"3-8-black-iron-elbow-90-street","title":"Mueller Streamline 520-302 3\/8\" Black Iron Elbow - 90° (Street)","description":"\u003cp\u003eMueller Streamline 520-302 is a 3\/8\" elbow 90° (street) in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA street elbow has one male threaded end, so it goes straight into another fitting without a separate piece of nipple, which makes the turn tighter and saves a joint.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-302\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90° (Street)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370302\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.44 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044190311,"sku":"BLIF-038-ST90","price":3.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_S_66_11e56871-07c8-45f1-b030-9f7fec08f087.jpg?v=1785812125"},{"product_id":"3-8-black-iron-tee","title":"Mueller Streamline 520-602 3\/8\" Black Iron Tee","description":"\u003cp\u003eMueller Streamline 520-602 is a 3\/8\" tee in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA tee splits one line into two, or brings a branch into a run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-602\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Tee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370517\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.42 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044288615,"sku":"BLIF-038-TEE","price":3.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_TEE_S_159_585e7cfd-dcc5-4a1e-b308-a65afb296e24.jpg?v=1785812126"},{"product_id":"3-8-black-iron-union","title":"Mueller Streamline 521-702 3\/8\" Black Iron Union","description":"\u003cp\u003eMueller Streamline 521-702 is a 3\/8\" union in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA union can be taken apart without cutting the line, so equipment such as a pump, water heater or valve can be removed for service.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-702\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Union\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371804\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044386919,"sku":"BLIF-038-UNI","price":8.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_UNI_81_a794f3b9-2501-4683-b8c4-009934eb64ea.jpg?v=1785812127"},{"product_id":"3-8-x-1-8-black-iron-bushing","title":"Mueller Streamline 521-920 3\/8\" x 1\/8\" Black Iron Bushing","description":"\u003cp\u003eMueller Streamline 521-920 is a 3\/8\" x 1\/8\" bushing in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA bushing threads into a larger female fitting to reduce it: male thread outside, smaller female thread inside.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-920\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\" x 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Bushing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371903\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.45 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044419687,"sku":"BLIF-038.018-BSH","price":3.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_BSH_219_06826d9b-7548-4aa0-b7b8-70c15259fa46.jpg?v=1785812128"},{"product_id":"3-8-x-1-8-black-iron-coupling","title":"Mueller Streamline 521-320 3\/8\" x 1\/8\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-320 is a 3\/8\" x 1\/8\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-320\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\" x 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371484\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.35 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044452455,"sku":"BLIF-038.018-CPL","price":2.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COU_R_260_d07f6796-4ae6-4aa3-b4f7-cb2e699bd584.jpg?v=1785812129"},{"product_id":"3-8-x-1-4-black-iron-bushing","title":"Mueller Streamline 521-921 3\/8\" x 1\/4\" Black Iron Bushing","description":"\u003cp\u003eMueller Streamline 521-921 is a 3\/8\" x 1\/4\" bushing in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA bushing threads into a larger female fitting to reduce it: male thread outside, smaller female thread inside.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-921\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\" x 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Bushing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371910\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.45 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044485223,"sku":"BLIF-038.025-BSH","price":3.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_BSH_217.jpg?v=1785812130"},{"product_id":"3-8-x-1-4-black-iron-coupling","title":"Mueller Streamline 521-321 3\/8\" x 1\/4\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-321 is a 3\/8\" x 1\/4\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-321\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\" x 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371491\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.35 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044550759,"sku":"BLIF-038.025-CPL","price":2.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COU_R_260_786ec1d0-00fd-4ba5-91eb-1f34462c2cf6.jpg?v=1785812132"},{"product_id":"1-2-black-iron-elbow-45","title":"Mueller Streamline 520-203 1\/2\" Black Iron Elbow - 45°","description":"\u003cp\u003eMueller Streamline 520-203 is a 1\/2\" elbow 45° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 45° elbow makes a gentle change of direction; two of them offset a line around an obstacle.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-203\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 45°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888361997\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.33 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044649063,"sku":"BLIF-050-45EL","price":2.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_045_101_80cfa726-2d2d-4205-8dee-117ceab419ad.jpg?v=1785812133"},{"product_id":"1-2-black-iron-elbow-90","title":"Mueller Streamline 520-003 1\/2\" Black Iron Elbow - 90°","description":"\u003cp\u003eMueller Streamline 520-003 is a 1\/2\" elbow 90° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 90° elbow turns the line a quarter turn.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-003\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888361850\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.21 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044681831,"sku":"BLIF-050-90EL","price":1.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_17.jpg?v=1785812134"},{"product_id":"1-2-black-iron-cap","title":"Mueller Streamline 521-403 1\/2\" Black Iron Cap","description":"\u003cp\u003eMueller Streamline 521-403 is a 1\/2\" cap in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA cap closes off the end of a line, for a future connection or to hold pressure during a test.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-403\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Cap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362642\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.22 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044714599,"sku":"BLIF-050-CAP","price":1.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_CAP_30_3868ebfa-a86c-4657-9c84-c1fbc4066d2c.jpg?v=1785812135"},{"product_id":"1-2-black-iron-coupling","title":"Mueller Streamline 521-203 1\/2\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-203 is a 1\/2\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-203\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362437\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.21 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044747367,"sku":"BLIF-050-CPL","price":2.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COUP_173_b8a23c9e-4a79-4392-b4c7-972ec6996308.jpg?v=1785812136"},{"product_id":"1-2-black-iron-floor-flange","title":"Mueller Streamline 521-603 1\/2\" Black Iron Floor Flange","description":"\u003cp\u003eMueller Streamline 521-603 is a 1\/2\" floor flange in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA floor flange screws down to a floor, wall or ceiling and takes a threaded pipe, for pipe supports, railings or equipment stands.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-603\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Floor Flange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371750\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 1.36 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044780135,"sku":"BLIF-050-FFLG","price":6.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_FF_277.jpg?v=1785812137"},{"product_id":"1-2-black-iron-plug","title":"Mueller Streamline 521-803 1\/2\" Black Iron Plug","description":"\u003cp\u003eMueller Streamline 521-803 is a 1\/2\" plug in black malleable iron, MPT (MPT = male pipe thread).\u003c\/p\u003e\u003cp\u003eA plug threads into a female opening to close it.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-803\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362765\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.24 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044812903,"sku":"BLIF-050-PLG","price":1.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_PLG_47.jpg?v=1785812138"},{"product_id":"1-2-black-iron-elbow-45-street","title":"Mueller Streamline 520-503 1\/2\" Black Iron Elbow - 45° (Street)","description":"\u003cp\u003eMueller Streamline 520-503 is a 1\/2\" elbow 45° (street) in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA street elbow has one male threaded end, so it goes straight into another fitting without a separate piece of nipple, which makes the turn tighter and saves a joint.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-503\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 45° (Street)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362147\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.48 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044878439,"sku":"BLIF-050-ST45","price":3.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_045_S_86.jpg?v=1785812139"},{"product_id":"1-2-black-iron-elbow-90-street","title":"Mueller Streamline 520-303 1\/2\" Black Iron Elbow - 90° (Street)","description":"\u003cp\u003eMueller Streamline 520-303 is a 1\/2\" elbow 90° (street) in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA street elbow has one male threaded end, so it goes straight into another fitting without a separate piece of nipple, which makes the turn tighter and saves a joint.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-303\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90° (Street)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362055\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.45 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044943975,"sku":"BLIF-050-ST90","price":3.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_S_65.jpg?v=1785812141"},{"product_id":"1-2-black-iron-tee","title":"Mueller Streamline 520-603 1\/2\" Black Iron Tee","description":"\u003cp\u003eMueller Streamline 520-603 is a 1\/2\" tee in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA tee splits one line into two, or brings a branch into a run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-603\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Tee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362239\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.26 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351044976743,"sku":"BLIF-050-TEE","price":2.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_TEE_S_159_b5d3f0ba-40bb-4cf1-9f02-c772b2217fc4.jpg?v=1785812141"},{"product_id":"1-2-black-iron-union","title":"Mueller Streamline 521-703 1\/2\" Black Iron Union","description":"\u003cp\u003eMueller Streamline 521-703 is a 1\/2\" union in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA union can be taken apart without cutting the line, so equipment such as a pump, water heater or valve can be removed for service.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-703\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Union\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362703\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.92 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045009511,"sku":"BLIF-050-UNI","price":7.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_UNI_82.jpg?v=1785812143"},{"product_id":"1-2-x-1-8-black-iron-bushing","title":"Mueller Streamline 521-930 1\/2\" x 1\/8\" Black Iron Bushing","description":"\u003cp\u003eMueller Streamline 521-930 is a 1\/2\" x 1\/8\" bushing in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA bushing threads into a larger female fitting to reduce it: male thread outside, smaller female thread inside.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-930\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Bushing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371927\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.45 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045042279,"sku":"BLIF-050.018-BSH","price":3.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_BSH_212.jpg?v=1785812144"},{"product_id":"1-2-x-1-8-black-iron-coupling","title":"Mueller Streamline 521-330 1\/2\" x 1\/8\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-330 is a 1\/2\" x 1\/8\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-330\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 1\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371576\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.39 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045075047,"sku":"BLIF-050.018-CPL","price":2.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COU_R_260_67601d60-7272-440f-a3ef-67525e689080.jpg?v=1785812145"},{"product_id":"1-2-x-1-4-black-iron-bushing","title":"Mueller Streamline 521-931 1\/2\" x 1\/4\" Black Iron Bushing","description":"\u003cp\u003eMueller Streamline 521-931 is a 1\/2\" x 1\/4\" bushing in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA bushing threads into a larger female fitting to reduce it: male thread outside, smaller female thread inside.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-931\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Bushing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371934\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.45 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045107815,"sku":"BLIF-050.025-BSH","price":3.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_BSH_214.jpg?v=1785812146"},{"product_id":"1-2-x-1-4-black-iron-coupling","title":"Mueller Streamline 521-331 1\/2\" x 1\/4\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-331 is a 1\/2\" x 1\/4\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-331\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888371583\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.32 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045173351,"sku":"BLIF-050.025-CPL","price":2.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COU_R_260_246c70ab-8b23-4b1a-ac39-5edb67104a88.jpg?v=1785812147"},{"product_id":"1-2-x-3-8-black-iron-elbow-90","title":"Mueller Streamline 520-132 1\/2\" x 3\/8\" Black Iron Elbow - 90°","description":"\u003cp\u003eMueller Streamline 520-132 is a 1\/2\" x 3\/8\" elbow 90° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 90° elbow turns the line a quarter turn.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-132\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888361911\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.37 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045238887,"sku":"BLIF-050.038-90EL","price":3.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_R_122.jpg?v=1785812149"},{"product_id":"1-2-x-3-8-black-iron-bushing","title":"Mueller Streamline 521-932 1\/2\" x 3\/8\" Black Iron Bushing","description":"\u003cp\u003eMueller Streamline 521-932 is a 1\/2\" x 3\/8\" bushing in black malleable iron, MPT x FPT (MPT = male pipe thread, FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA bushing threads into a larger female fitting to reduce it: male thread outside, smaller female thread inside.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-932\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Bushing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e MPT x FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362826\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.45 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045271655,"sku":"BLIF-050.038-BSH","price":3.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_BSH_212_25ae0fd5-7e2b-4952-9612-ce97cf47879f.jpg?v=1785812150"},{"product_id":"1-2-x-3-8-black-iron-coupling","title":"Mueller Streamline 521-332 1\/2\" x 3\/8\" Black Iron Coupling","description":"\u003cp\u003eMueller Streamline 521-332 is a 1\/2\" x 3\/8\" coupling in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA coupling joins two lengths of the same size in a straight run.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 521-332\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 3\/8\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362499\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.3 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045304423,"sku":"BLIF-050.038-CPL","price":2.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_COU_R_260_be21ccd0-e664-40d3-b577-ca7fe0af8327.jpg?v=1785812153"},{"product_id":"1-2-x-1-2-x-3-4-black-iron-tee","title":"Mueller Streamline 520-334 1\/2\" x 1\/2\" x 3\/4\" Black Iron Tee","description":"\u003cp\u003eMueller Streamline 520-334 is a 1\/2\" x 1\/2\" x 3\/4\" tee in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA reducing tee: the first two figures are the run (1\/2\" and 1\/2\") and the last is the branch (3\/4\").\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-334\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 1\/2\" x 3\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Tee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362116\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.77 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045369959,"sku":"BLIF-050.075-TEE","price":5.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_TEE_134.jpg?v=1785812155"},{"product_id":"1-2-x-1-2-x-1-black-iron-tee","title":"Mueller Streamline 520-335 1\/2\" x 1\/2\" x 1\" Black Iron Tee","description":"\u003cp\u003eMueller Streamline 520-335 is a 1\/2\" x 1\/2\" x 1\" tee in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA reducing tee: the first two figures are the run (1\/2\" and 1\/2\") and the last is the branch (1\").\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-335\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\" x 1\/2\" x 1\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Tee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888370340\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 2.04 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045435495,"sku":"BLIF-050.100-TEE","price":8.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_TEE_134_bcb91d0e-90cd-4de9-b6a7-18b8d35adab7.jpg?v=1785812156"},{"product_id":"3-4-black-iron-elbow-45","title":"Mueller Streamline 520-204 3\/4\" Black Iron Elbow - 45°","description":"\u003cp\u003eMueller Streamline 520-204 is a 3\/4\" elbow 45° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 45° elbow makes a gentle change of direction; two of them offset a line around an obstacle.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-204\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 45°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888362000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.46 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045468263,"sku":"BLIF-075-45EL","price":3.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_045_98.jpg?v=1785812157"},{"product_id":"3-4-black-iron-elbow-90","title":"Mueller Streamline 520-004 3\/4\" Black Iron Elbow - 90°","description":"\u003cp\u003eMueller Streamline 520-004 is a 3\/4\" elbow 90° in black malleable iron, FPT (FPT = female pipe thread).\u003c\/p\u003e\u003cp\u003eA 90° elbow turns the line a quarter turn.\u003c\/p\u003e\u003cp\u003eClass 150 black malleable iron fittings are the standard threaded fitting for natural gas and propane lines, steam, compressed air and fire sprinkler work. Material is to ASTM A197 and dimensions to ASME B16.3, with tapered NPT threads, so they make up with Schedule 40 black pipe and nipples. Black iron is not used on potable water.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mueller Streamline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 520-004\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Elbow 90°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black malleable iron, Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASTM A197 material, ASME B16.3 dimensions, ASME B1.20.1 NPT threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e 300 psi water, oil and gas (non-shock); 150 psi saturated steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 032888361867\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.24 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Black Iron Fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/black-iron-fittings\"\u003eall black iron fittings\u003c\/a\u003e, \u003ca href=\"\/collections\/tape-sealants\"\u003ethread sealant\u003c\/a\u003e, \u003ca href=\"\/collections\/black-iron-nipples\"\u003eblack iron nipples\u003c\/a\u003e, \u003ca href=\"\/collections\/mueller-streamline\"\u003eall Mueller Streamline\u003c\/a\u003e.\u003c\/p\u003e","brand":"Mueller Streamline","offers":[{"title":"Default Title","offer_id":44351045501031,"sku":"BLIF-075-90EL","price":2.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/BLIF_090_14.jpg?v=1785812158"}],"url":"https:\/\/www.thehousesupplier.com\/collections\/black-iron-fittings.oembed","provider":"The House Supplier","version":"1.0","type":"link"}