Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Inline Spring Piston Body Material - Valves Brass Buna-N Stainless Steel Pipe or Tube Size 1/4 in Connection Type FNPT x FNPT Cracking Pressure 3 psi Mounting Orientation Horizontal Vertical Seal Material Buna-N Max Temp - Valves 194 Degrees F Min Temp - Valves 40 Degrees F Max Water Pressure - Valves 4 500 psi Max Steam Pressure - Valves Not Rated Seat Material Stainless Steel