Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Piston, Body Material - Valves Stainless Steel, Pipe or Tube Size 3/8 in, Connection Type FNPT x FNPT, Cracking Pressure 1 psi, Mounting Orientation Horizontal, Vertical, Seal Material Buna-N, Max. Temp. - Valves 180 Degrees F, Min. Temp. - Valves -20 Degrees F, Max. Water Pressure - Valves 500 psi, Max. Steam Pressure - Valves Not Rated, Seat Material Stainless Steel, Spring Material Stainless Steel