Item – Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Spring, Body Material – Valves 316 Stainless Steel, Pipe or Tube Size 1 1/2 in, Connection Type FNPT x FNPT, Cracking Pressure 0.5 psi, Mounting Orientation Horizontal, Vertical, Seal Material Viton, Max. Temp. – Valves 302 Degrees F, Max. Water Pressure – Valves 250 psi, Max. Steam Pressure – Valves Not Rated, Seat Material FKM, Spring Material 316 Stainless Steel, Flow – Valves 48 gpm