I’m going to go with the check valve suggestion. The purpose being to prevent backfilling the fresh water reservoir when connected to “city water”. I’m guessing that every camper has one, that one is just very close to the pump.
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If you're not livin' on the edge, you're takin' up too much space!
2007 Shadow Cruiser x210, 2004 RAM 2500 4x4 QuadCab SLT 5.9L CTD, Factory Tow Pkg (3.73 axle), HaulMaster WDH
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