TC Series true union ball check valves are offered in PVC, CPVC, and PP. O-rings and seats are FPM or EPDM. 1/4 in. and 3/8 in. sizes are PVC only and are trim check design. They have socket or threaded end connections. Others up to 2 in. sizes have socket and threaded end connections. All valves are assembled with silicone free lubricant.