Unlimited water supply that protects your boats freshwater system. The Shuflo water regulator inlet provides a port to connect to city water for an unlimited supply of freshwater. An internal check valve maintains a nominal pressure and guards the freshwater pump, fixtures and hoses against high pressure surges. A integrated backflow preventer allows the system to seamless switch back to onboard water tanks. Key Features Convenient inlet to connect freshwater system to dock supplied city water Protects onboard freshwater system from high pressure surges from city supplied water Integrated backflow preventer allows onboard system to function as normal when not connected to city water Flush mounted inlet prevent hose connections from catching on dock lines and fender whips Installation Instructions