Item - Check Valves Check Valve Flow Design Single Mechanism and Body Design Inline Swing Body Material - Valves Ductile Iron Pipe or Tube Size 4 in Connection Type FNPT x FNPT Cracking Pressure 0 psi Mounting Orientation Horizontal Seal Material Viton Max Temp - Valves 280 Degrees F Min Temp - Valves 0 Degrees F Max Water Pressure - Valves 2 000 psi @ 250 Degrees F Max Steam Pressure - Valves Not Rated Seat Material Viton Flow - Valves 400 gpm Full Flow - Valves Yes