The main water line is to fill the fresh tank, or pressurize the main water lines. the small line is to pump in potable antifreeze to winterize the system. The main input line has a check valve.
The switch is for the water pump when using the outside shower. Both that switch and the inside (control panel) switch operate the water pump. IF either switch is on the pump is on...
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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