Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Inline Piston Body Material - Valves Brass Pipe or Tube Size 1/2 in Connection Type FNPT X MNPT Cracking Pressure 1 psi Mounting Orientation Horizontal Vertical Seal Material Viton Max Temp - Valves 180 Degrees F Min Temp - Valves -20 Degrees F Max Water Pressure - Valves 500 psi Max Steam Pressure - Valves Not Rated Seat Material Brass Spring Material Stainless Steel Full Flow - Valves Yes