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(1) Drain the freshwater tank using the petcock or other type of valve. Many trailers will have one like this. Higher-end trailers and fifth-wheels may have one in the utility compartment. Check your RV owner’s manual.
(4) The water heater may have a bypass like this one, which has three valves. When the handle is across the pipe, the valve is closed. This one is in bypass mode; the top and bottom valves are closed, and the interconnecting pipe valve is open, which connects the hot and cold plumbing before the tank.
(8) When there is no winterizing kit, the hose can be disconnected from the inlet side of the pump’s inline filter, and a 3-foot suction hose with a 1⁄2-inch NPT female PEX fitting clamped on the end can be attached. These parts are available at most home centers and hardware stores. An alternative is to install Camco’s Pump Converter Winterizing Kit.

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