While using a shower head is recommended, connecting straight to the hot water side of the faucet is also perfectly fine. When the water faucet is turned on, the valve at the end of one of the service line's intake pipes opens. The intake pipes are located on the cold and hot water settings of each water appliance in your RV. This is where the cold and hot water supply pipes are connected. Thanks to these two pipe connections, your appliance will have access to both cold and hot water.