Water Diaphragm Pump 12V, 3.5 GPM, 55 PSI, Self Priming

12V RV water diaphragm pump delivers steady, on-demand pressure for faucets, sprayers, and washdowns—ideal when you need reliable flow in a camper, marine boat, or lawn setup. With 3.5 GPM open flow and a 55 PSI rated output (adjustable 40–80 PSI), it helps reduce weak water pressure and frequent cycling. Self-priming up to 6 ft supports flexible installs, while the automatic pressure switch starts/stops with tap use for hands-off operation.

• Delivers 3.5 GPM open flow for faster tank fill, showering, rinsing, and sprayer use


• Adjusts pressure from 40–80 PSI with a 55 PSI rating to match RV and marine plumbing needs


• Starts/stops automatically via pressure switch when you open or close the faucet


• Protects with overload protection and short-period dry-run capability for tougher conditions


• Includes sealing tape and 1/2" MNPT ports for quicker, cleaner connections

Built for daily utility and quick-scan reliability, this self-priming diaphragm pump supports RV campers, yachts, boats, irrigation lines, courtyard long-distance pumping, and vehicle washing. The 4-chamber design with Santoprene diaphragm and EPDM valves helps maintain smooth operation, and the PA6 + 30% glass fiber housing adds durability. Rated for liquids up to 140°F/60°C and backed by FCC certification, it’s a practical upgrade for consistent water pressure without constant manual switching. Grab yours today and get your water system running the way it should.

• Power: 12V, 7.5A


• Max flow rate: 3.5 GPM


• Rated pressure: 55 PSI (adjustable 40–80 PSI)


• Self-priming suction height: 6 ft / 1.8 m


• Ports: 1/2" MNPT inlet/outlet (12.7 mm)


• Max liquid temperature: 140°F / 60°C


• Ambient temperature: 32–140°F / 0–60°C


• Diaphragm chambers: 4


• Diaphragm material: Santoprene


• Valve material: EPDM


• Housing material: PA6 + 30% glass fiber


• Certifications: FCC


• Size (L×W×H): 8.35" × 4.9" × 4.32" (212 × 124.5 × 109.75 mm)


• Weight: 4.19 lb / 1.9 kg