Check Valve, Flow Design Single, Mechanism and Body Design Inline Piston, Body Material – Valves Stainless Steel, Pipe or Tube Size – Check Valves 1-1/2 In., Connection Type – Check Valves FNPT x FNPT, Mounting Orientation – Check Valves Horizontal, Seal Material – Check Valves 316 Stainless Steel, Graphite, Max. Temp. – Valves 850 Degrees F, Min. Temp. – Valves 20 Degrees F, Max. Water Pressure – Valves 1600 psi @ 100 Degrees F