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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.
(2) Drain the water heater by removing the plug or anode rod, depending on the brand, unless you have a specialty or on-demand water heater. Make sure the pressure is released from the system before removing the plug.
(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.

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