Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Spring, Body Material - Valves Kynar(R), Pipe or Tube Size 3/8 in x 1/4 in, Connection Type Push x MNPT, Cracking Pressure 0.5 psi, Mounting Orientation Horizontal, Vertical, Seal Material Fluorocarbon, Max. Temp. - Valves 250 Degrees F, Min. Temp. - Valves 0 Degrees F, Max. Water Pressure - Valves 150 psi, Max. Steam Pressure - Valves Not Rated, Seat Material Fluorocarbon, Spring Material Stainless Steel WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)