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 Pump, 12V Self-priming RV Water Pressure Pump 4.0GPM 45PSI with Pressure Switch, for RV Marine Camping Yacht Garden, 12Volt DC Fresh Water Pumps RV Water Pump 2088-554-144 Replacement (ASIN B0BFB1FMKV). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0BFB1FMKV).
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.