Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Inline Spring Swing Body Material - Valves PVC Pipe or Tube Size 1/2 in Connection Type FNPT x FNPT Cracking Pressure 0.5 psi Mounting Orientation Horizontal Vertical Seal Material NBR Max Temp - Valves 73 Degrees F Min Temp - Valves 35 Degrees F Max Water Pressure - Valves 150 psi Max Steam Pressure - Valves Not Rated Seat Material PVC Spring Material Stainless Steel Flow - Valves 100 gpm