SharkBite U2008-0000LFA Lead Free Brass Push-Fit Check Valve, 1/2" x 1/2"SharkBite Check Valve is general purpose, spring loaded check valve that are easily installed on Copper, CPVC, PEX and PE RT lines. This can be installed horizontally or vertically and prevents the reverse flow of water through the water supply line. 1 2" x 1 2" For use with copper tubing, CPVC & pex with integral tube liner included Constructed of DZR brass Certified to 200 PSI & 200 degrees fahrenheit Design certified to ASSE1061 NSF61 standards