ECO-WORTHY
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.
ECO-WORTHY RV Fresh Water Pump 12V DC 3.5GPM 45PSI with Pressure Switch, 12Volt Self Priming Water Pressure Diaphragm Pump On demand for RV Yacht Camper Sprayer Food Truck Black (ASIN B0BVMDL77Y). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0BVMDL77Y).
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.