The Viking Swing Check Valve is a general purpose rubber-faced check valve approved for use in fire protection systems and is rated with a 300 psi maximum working pressure. The Model D-1 (flange x flange) and G-1 (groove x groove) Swing Check Valve is manufactured with a ductile iron body, brass seat, and a rubber-faced clapper assembly, hinged to a removable access cover for easy inspection and maintenance. The valve may be installed vertically or horizontally with access cover facing up.