Horizontal swing check valve. A positive seating disc allows flow only in one direction and a screw-in cap provides easy access for periodic cleaning. Swing check valves are designed to prevent back flow in plumbing and liquid piping systems, while offering full flow performance with a minimum of turbulence or pressure loss. Made of brass. For horizontal or vertical use. Brass disc. Rated to 200 psi pressure WOG. Temperature range -20 to 150 degree F. 3" NPT female x 3" NPT female.