Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Inline True Union Body Material - Valves PVC Pipe or Tube Size 1 in Connection Type FNPT x Socket Cracking Pressure 3 psi Mounting Orientation Vertical Seal Material EPDM Max Temp - Valves 140 Degrees F Min Temp - Valves 40 Degrees F Max Water Pressure - Valves 235 psi @ 70 Degrees F Max Steam Pressure - Valves Not Rated Seat Material EPDM Flow - Valves 18 gpm Full Flow - Valves Yes