SharkBite U3523LFA Stop Valve Connector Plumbing Fitting, Compression Push-to-Connect PEX, Copper, CPVC, 1/4 x 9/16-Inch-24 UNEF Thread x 3/8-Inch No soldering, clamps, unions, or glue required. Connects copper, PEX, and CPVC pipe in any combination. Approved to be used underground and behind walls without access panels. Lead Free Compliant