Check Valve, Flow Design Single, Mechanism and Body Design Inline Piston, Body Material – Valves Carbon Steel, Pipe or Tube Size – Check Valves 1-1/4 In., Connection Type – Check Valves Socket x Socket, Mounting Orientation – Check Valves Horizontal, Seal Material – Check Valves 304 Stainless Steel, Graphite, Max. Temp. – Valves 800 Degrees F, Min. Temp. – Valves 20 Degrees F, Max. Water Pressure – Valves 1975 psi @ 100 Degrees F