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Referring to the OP, are you sure this rig HAS a bypass between city water and fresh water tank? I'm on my first 5th wheel (I believe listed in signature). To operate from city water, you simply connect the hose to the water input and apply pressure. The fresh water pump (which would pump water from the fresh tank to the coach) has a check valve that prevents water from flowing to from the trailer plumbing into the fresh tank. At least that is what it is SUPPOSED to do! I have had an instance where the check valve didn't seal and the fresh tank filled with water,
I DO have a bypass valve to allow for winterization and bypass the water heater tank...
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