Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Inline Disc Body Material - Valves Polypropylene Pipe or Tube Size 1/2 in Connection Type FNPT x Socket Cracking Pressure 0.5 psi Mounting Orientation Horizontal Vertical Seal Material Viton Max Temp - Valves 180 Degrees F Min Temp - Valves 32 Degrees F Max Water Pressure - Valves 100 psi @ 77 Degrees F Max Steam Pressure - Valves Not Rated Seat Material Viton Flow - Valves 4 gpm