DC HOUSE
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.
DC HOUSE 33 Series 12V RV Water Pump 3.5GPM 45PSI, 3-Chamber Diaphragm Pump with Built-in Pressure Switch, Quiet Self-Priming Demand Pump for Camper, Boat, Cabin, Off-Grid System (ASIN B0GJ2TYB21). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0GJ2TYB21).
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.