Item – Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Spring Piston, Body Material – Valves Brass, Buna-N, Stainless Steel, Pipe or Tube Size 1/4 in, Connection Type FNPT x FNPT, Cracking Pressure 3 psi, Mounting Orientation Horizontal, Vertical, Seal Material Buna-N, Max. Temp. – Valves 194 Degrees F, Min. Temp. – Valves 40 Degrees F, Max. Water Pressure – Valves 4,500 psi, Max. Steam Pressure – Valves Not Rated, Seat Material Stainless Steel