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Bypass valve is the valve that connects the hot and cold water lines together. During normal operation that valve is closed (valves on hot & cold water lines are open). When you winterize that valve is opened (valves on hot & cold water lines are closed) so that you bypass the hot water heater tank when you are putting RV antifreeze in the lines. The drawings in the first post show this clearly.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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