Item – Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Spring, Body Material – Valves Brass, Pipe or Tube Size 1 in, Connection Type FNPT x FNPT, Cracking Pressure 0.5 psi, Mounting Orientation Horizontal, Vertical, Seal Material NBR, Max. Temp. – Valves 158 Degrees F, Min. Temp. – Valves 35 Degrees F, Max. Water Pressure – Valves 200 psi, Max. Steam Pressure – Valves Not Rated, Seat Material Bronze, Spring Material Stainless Steel, Flow – Valves 18 gpm