Smith-Cooper International CV50 Series PVC Check Valve, 1" Slip Made from PVC for corrosion resistance, high strength, and less weight than fittings made from metal Includes EPDM seat and seal, stainless steel spring, and spring-loaded poppet Slip openings for connecting to male unthreaded pipes or fitting Cracking pressure is 2 psi Maximum pressure rating is 150 psi