SWCV400 by Dixon Valve | Swing Check Valve | 4" Female NPT x 4" Female NPT | BrassFeatures: Full flow performance with a minimum of turbulence or pressure loss. A positive seating disc allows flow only in one direction and a screw in cap provides easy access for periodic cleaning. Materials: Brass disc. Specifications: Pressure rating: 200 PSI WOG Temperature range: 20 to 150F ( 29C to 66C) Part Number Female NPT x Female NPT SWCV50 1 2" x 1 2" SWCV75 3 4" x 3 4" SWCV100 1" x 1" SWCV125 1 1 4" x 1 1 4" SWCV150 1 1 2" x 1 1 2"