Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Inline Spring Body Material - Valves 316 Stainless Steel Pipe or Tube Size 1/4 in Connection Type FNPT x FNPT Cracking Pressure 3.6 psi Mounting Orientation Horizontal Vertical Seal Material FKM Max Temp - Valves 356 Degrees F Min Temp - Valves -4 Degrees F Max Water Pressure - Valves 580 psi Max Steam Pressure - Valves Not Rated Seat Material FKM Spring Material 302 Stainless Steel