Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline True Union, Body Material - Valves CPVC, Pipe or Tube Size 1 1/4 in, Connection Type FNPT x Socket, Cracking Pressure 3 psi, Mounting Orientation Vertical, Seal Material EPDM, Max. Temp. - Valves 190 Degrees F, Min. Temp. - Valves 40 Degrees F, Max. Water Pressure - Valves 235 psi @ 70 Degrees F, Max. Steam Pressure - Valves Not Rated, Seat Material EPDM, Flow - Valves 30 gpm, Full Flow - Valves Yes Designed to help prevent the reversal of flow in piping systems where backflow could cause damage to filters, pumps, or process equipment. This HAYWARD check valve operates without the need for any adjustments or settings, and features an innovative square-cut elastomer seat to seal at low back pressures. The.