SharkBite U2016-0000LFA Check Valves, 3/4-Inch Innovative push-fit design makes for a quick & easy install It's the easiest way to join Copper, CPVC or pex pipe Corrosion resistant to improve longevity No soldering, clamps, unions, or glue required. Connects copper, PEX, and CPVC pipe in any combination. Designed for vertical and horizontal installation Lead Free Compliant