The 2 hoses out the bottom are the low water points in your system....must be drained. Careful not to lose the gaskets that are usually in the caps. Hot water heater has a drain near the bottom of it also. Mine is attached to the anode rod, then flip the pressure relief switch to help it drain. Then you put in the pink RV anti-freeze until it comes out all the faucets, but mine has a hot water heater bypass switch so none gets in there. Every RV is different but living where you do, it must be winterized. You also drain the fresh water out.