Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Disc, Body Material - Valves PVC, Pipe or Tube Size 1 1/2 in, Connection Type FNPT x Socket, Cracking Pressure 1. Steam Pressure - Valves Not Rated, Seat Material Viton, Spring Material PFA 1-1/2" FNPT PVC Check Valve Temp.