Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Spring, Body Material - Valves Lead Free Cast Copper Silicon Alloy, Pipe or Tube Size 1/2 in, Connection Type FNPT, Cracking Pressure 0.5 psi, Mounting Orientation Horizontal, Vertical, Seal Material Viton, Max. Temp. - Valves 100 Degrees F, Min. Temp. - Valves -20 Degrees F, Max. Water Pressure - Valves 250 PSI @ 100 Degrees F, Max. Steam Pressure - Valves Not Rated