Item – Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Spring, Body Material – Valves 316 Stainless Steel, Pipe or Tube Size 1/2 in, Connection Type FNPT x FNPT, Cracking Pressure 3.6 psi, Mounting Orientation Horizontal, Vertical, Seal Material FKM, Max. Temp. – Valves 356 Degrees F, Min. Temp. – Valves -4 Degrees F, Max. Water Pressure – Valves 580 psi, Max. Steam Pressure – Valves Not Rated, Seat Material FKM, Spring Material 302 Stainless Steel