wassermann
A 12V water pump pressurizes the RV's water system from the fresh-water tank. If you always run on city water and your pump works, you may not need one.
RV owners replacing a worn pump or adding tank water.
WASSERMANN RV Water Pump 12 Volt DC 5.0GPM 55PSI Replacement For 4008-101-A65 Water Pump Self Priming Diaphragm Pump with Pressure Switch for RV Kitchen Bathroom Marine Yacht Garden Camper Water Pumps (ASIN B0BF9VYCK8). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0BF9VYCK8).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.