Mueller Streamline W 04043R is a 3/4" x 1/2" x 1/2" tee in wrot copper, C x C x C (C = sweat socket (takes the tube)).
A reducing tee: the first two figures are the run (3/4" and 1/2") and the last is the branch (1/2").
These fittings are cleaned for oxygen service to CGA G-4.1 and sealed in a bag at the factory, which is what NFPA 99 requires for medical gas and oxygen piping. Keep them bagged until the joint is made, and braze with a nitrogen purge. The same fittings also suit refrigeration work where a clean interior matters.
Specifications
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Brand: Mueller Streamline
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Manufacturer Part #: W 04043R
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Size: 3/4" x 1/2" x 1/2"
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Type: Tee
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Connections: C x C x C
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Material: Wrot copper (UNS C12200)
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Cleaning: Cleaned for oxygen service to CGA G-4.1, bagged
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Code: Meets NFPA 99 cleanliness requirements
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UPC: 685768341550
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Shipping Weight: 0.106 lb
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Category: Copper Sweat Fittings (Cleaned & Bagged)
See also: all copper sweat fittings (cleaned & bagged), line sets, refrigeration tools, all Mueller Streamline.