The Water Heater Bypass is used when winterizing the water system. It is a series of valves or a single lever valve that allows the water flow to be shut off from the water heater and still be pumped to the rest of the hot water piping. This eliminates the need to fill the water heater tank with 6 gallons of winterizing antifreeze ... the tank is bypassed and then drained of water.

Single lever valve system ...

This bypass system uses three valves ...

... and the next uses one valve with a one-way check valve at the hot water outlet ...

Bypass the Water Filter

If your coach is equipped with an inline water filter it must be removed and bypassed to allow the antifreeze to fill these lines.