Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline True Union, Body Material - Valves Polypropylene, Pipe or Tube Size 1 in, Connection Type FNPT x FNPT, Cracking Pressure 3 psi, Mounting Orientation Vertical, Seal Material Viton, Max. Temp. - Valves 250 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 Viton, Flow - Valves 18 gpm, Full Flow - Valves Yes