When we rebuilt our Scamp, we put in a Y fitting with a backflow preventer that allowed us to use either city water or water from the holding tank (we only use it for washing dishes/hands, etc. If we are connected to city water, the back flow preventer stops water from going into the tank. If we aren't connected to city water, the outlet is plugged to prevent tank water from exiting where the city water would connect. The only other outlet, then, is toward the faucet (actually a water filter). The faucet is a standard faucet. We plugged the hot water side (since we don't have a hot water heater and to prevent water coming back from the cold side). Works great! Hope this helps!