Item – Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline True Union, Body Material – Valves PVC, Pipe or Tube Size 4 in, Connection Type FNPT x FNPT, Cracking Pressure 3 psi, Mounting Orientation Vertical, Seal Material Viton, Max. Temp. – Valves 140 Degrees F, Min. Temp. – Valves 40 Degrees F, Max. Water Pressure – Valves 150 psi @ 70 Degrees F, Max. Steam Pressure – Valves Not Rated, Seat Material Viton, Flow – Valves 275 gpm, Full Flow – Valves Yes