The NIBCO® flanged cast iron horizontal swing check valve is designed with renewable seat and disc. Swing check valves prevent backflow by automatically closing when fluid reverses direction. This valve is generally installed between the Siamese connections and the riser to prevent backflow. The check valve is recommended for automatic fire sprinkler systems and is UL/ULC listed and FM approved. The cast iron check valve features flanged end connections for easy installation. The swing check valve includes a renewable rubber disc and bronze seat ring. Swing checks may be installed in horizontal positions (or vertical with flow moving up).