Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Poppet, Body Material - Valves 316 Stainless Steel, Pipe or Tube Size 3/8 in, Connection Type FNPT x FNPT, Cracking Pressure 1 psi, Mounting Orientation Horizontal, Vertical, Seal Material Fluorocarbon, Max. Temp. - Valves 275 Degrees F, Min. Temp. - Valves -30 Degrees F, Max. Water Pressure - Valves 6000 psi @ 100 Degrees F, Max. Steam Pressure - Valves Not Rated, Seat Material Fluorocarbon WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)