An RV usually would need 2 hoses. The 1st hose is the Rv sewer hose. You need this hose for dumping waste from a black and grey tank. A 10 feet pipe is reliable but always keep a 10 feet extension to prepare you for any scenario. The 2nd hose is the water hose pipe. It's for your freshwater needs. This tube is connected to the city fresh water hookup and you use the water collected for drinking, bath, and other essential needs.