{"product_id":"caleffi-573002a-573-combo-autofill-backflow-preventer-fill-valve-1-2-npt-x-npt-asse-1012","title":"Caleffi 573002A 573 COMBO AutoFill Backflow Preventer \u0026 Fill Valve 1\/2\" NPT x NPT, ASSE 1012","description":"\u003cp\u003eThe Caleffi 573002A COMBO AutoFill combines an ASSE 1012 backflow preventer and an automatic fill (pressure reducing) valve in one 1\/2\" body, with NPT x NPT threaded connections. It fills and maintains pressure in a closed hydronic heating system.\u003c\/p\u003e\u003cp\u003eInstalled on the cold water make-up line to a boiler, the fill valve keeps the system at its set fill pressure while the dual check backflow section with atmospheric vent protects the potable supply. Combining both functions in one compact unit saves space and connections compared with separate devices.\u003c\/p\u003e\u003cp\u003eBefore ordering, confirm the 1\/2\" NPT x NPT threaded connections and your required fill pressure; check the installation manual for the adjustment range. Allow for drainage from the backflow vent port.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Caleffi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 573002A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 573 COMBO AutoFill\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Backflow Preventer and Automatic Fill Valve Combination\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e NPT x NPT threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Temperature:\u003c\/strong\u003e 150F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Pressure:\u003c\/strong\u003e 175 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e ASSE 1012\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 8016615962000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e System Fill Tanks \u0026amp; Autofills\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDocuments\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/res.cloudinary.com\/dzhpkjoqj\/Caleffi\/573002A_CALE-573002A_8016615962000_TechB.pdf\" target=\"_blank\" rel=\"noopener\"\u003eTechnical Data Sheet\u003c\/a\u003e (PDF)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/res.cloudinary.com\/dzhpkjoqj\/Caleffi\/573002A_CALE-573002A_8016615962000_Inst.pdf\" target=\"_blank\" rel=\"noopener\"\u003eInstallation \u0026amp; Operation Manual\u003c\/a\u003e (PDF)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/res.cloudinary.com\/dzhpkjoqj\/Caleffi\/573002A_CALE-573002A_8016615962000_Sub.pdf\" target=\"_blank\" rel=\"noopener\"\u003eSubmittal Sheet\u003c\/a\u003e (PDF)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/res.cloudinary.com\/dzhpkjoqj\/Caleffi\/573002A_CALE-573002A_8016615962000_Sell.pdf\" target=\"_blank\" rel=\"noopener\"\u003eProduct Brochure\u003c\/a\u003e (PDF)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/system-fill-tanks-autofills\"\u003esystem fill tanks \u0026amp; autofills\u003c\/a\u003e, \u003ca href=\"\/collections\/caleffi-north-america\"\u003eall Caleffi products\u003c\/a\u003e.\u003c\/p\u003e","brand":"Caleffi","offers":[{"title":"Default Title","offer_id":50517448622183,"sku":"CALE-573002A","price":217.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/573002A_CALE-573002A_8016615962000.jpg?v=1792424483","url":"https:\/\/www.thehousesupplier.com\/products\/caleffi-573002a-573-combo-autofill-backflow-preventer-fill-valve-1-2-npt-x-npt-asse-1012","provider":"The House Supplier","version":"1.0","type":"link"}