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This (female sweat) adapter fitting connects 1/2" PEX pipe to 1/2" copper pipe in a straight line using Viega PEX press method and soldering. Made from lead-free bronze and approved for potable water use. Compatible with all types of PEX tubing (A, B, C), including Viega oxygen barrier and plumbing tubing, as well as Viega FostaPEX. Always solder the copper side of the fitting first, then cool and then connect the PEX side.