General The NIBCO® bronze horizontal swing check valve has a Y-pattern design with renewable Buna-N seat and disc. The swing check valve prevents backflow by automatically closing when fluid reverses direction. The check valve is recommended for fire protection trim valve service. Overview 200 psi/13.8 bar non-shock water working pressure (WWP) Y-pattern Renewable disc Regrindable seat Class 125 threaded end connections Conforms to MSS SP-80