Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Inline Spring Body Material - Valves Brass Pipe or Tube Size 1 1/2 in Connection Type FNPT x FNPT Cracking Pressure 0.5 psi Mounting Orientation Horizontal Vertical Max Temp - Valves 352 Degrees F Min Temp - Valves 0 Degrees F Max Water Pressure - Valves 400 psi Max Steam Pressure - Valves 125 psi WSP Seat Material Viton Spring Material Stainless Steel Flow - Valves 35.72 gpm Full Flow - Valves Yes