The Waterman Model PC-30 in-line Swing Check Valve is designed to offer a dependable low pressure swing check valve for the irrigation industry. This valve is constructed with a high strength cast-aluminum body and features a tight-sealing, nitrile rubber seat.  Hinge pins are stainless steel and operate in non-metallic hinge bushings with lubrication fittings. All models (4″, 5″, 6″, 8″ and 10″) are fitted with torsion springs on the covers for extra quick closing to prevent water hammer.