Control Devices H4-518-4331 Flexi-Hinge Check Valve is a 4-inch nominal-size check valve from Control Devices, part number H4-518-4331. As a Flexi-Hinge check valve, it is designed to allow flow in one direction while preventing backflow in piping systems. This unit supports standard 4-inch piping installations where unidirectional flow control is required.
