1/2" Check Valve, Sharkbite Push Fit Fittings For Use With Copper Tubing CTS, CPVC & Pex With Integral Tube Liner Included, Constructed Of DZR Brass, Certified To 200 PSI & 200 Degrees Fahrenheit, Design Certified To ASSE 1061/NSF61 Standards, Meets UPC, IPC & CUPC Requirements, Fitting Are Listed With IAPMO & Are Certified For Use On Potable & Hydronic Water Distribution, Certified For Underground Applications & As A Manufactured Joint Without The Need For Access Panels, Bagged.