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|The 646WG3 from Sioux Chief is a 3/4” PEX-A x 3/4” Male Threaded adapter. This fitting connects 3/4” PEX-A tubing to 3/4” female threaded fitting or outlet. Compatible with all brands of PEX-A tubing (Uponor/Wirsbo hePEX & AquaPEX, Sioux Chief, Mr. PEX, Rehau, etc.). Install using expansion method (expansion tool and rings).