Hayward's TC True Union Check Valves are available in PVC, CPVC, and PP and seats are FPM or EPDM. They are all put together with lubricant that has no silicone. They feature 1/2 in. to 6 in. are Sure Block layout, seats with minimum back pressure, 1/4 in. to 4 in. full port and 1/4 in. and 3/8 in. trim check design. These valves are suitable for aquaculture, pharmaceutical and more applications.