12V Water Diaphragm Pump, 5.5 GPM, 70 PSI, 1/2 MNPT

12V diaphragm water pump boosts water pressure on demand for RV, marine, camper, sprayer, and irrigation setups. Delivering up to 5.5 GPM with a 70 PSI rated pressure (adjustable 40–100 PSI), it self-primes to 6 ft for dependable flow at faucets, showers, and spray wands. A built-in pressure switch starts/stops automatically, while overload protection supports safer, more consistent operation.

• Delivers up to 5.5 GPM flow to improve low-pressure lines in RVs, boats, yard sprayers, and wash-down systems


• Adjusts pressure from 40–100 PSI with a 70 PSI rated setting for better control across multiple fixtures


• Starts automatically via pressure switch when a faucet opens, then stops when closed to reduce hassle


• Includes sealing tape to help reduce leaks and wear at 1/2" MNPT inlet/outlet connections


• Protects with overload protection and short dry-run capability; use in a sheltered, non-wet location (not waterproof)

Built for quick installs and fast pressure recovery, this self-priming on-demand pump is a practical upgrade for water systems that struggle with weak flow. The 5-chamber diaphragm design supports smooth delivery for intermittent use across RV plumbing, marine freshwater, lawn and garden irrigation, and sprayer applications. For quieter operation and reduced vibration, ensure adequate water flow and proper mounting. Grab yours today and restore steady water pressure where you need it.

• Power: 12V DC, 216W, 17A


• Max flow rate: 5.5 GPM


• Rated pressure: 70 PSI (adjustable 40–100 PSI)


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


• Inlet/Outlet: 1/2" MNPT


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


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


• Diaphragm chambers: 5; Diaphragm material: Santoprene


• Valve material: EPDM


• Shell material: PA6 + 30% glass fiber


• Filtration guideline: solids under 300 μm (50 mesh)


• Size (L×W×H): 8.63 × 5.83 × 5.16 in (219.2 × 148 × 131 mm)


• Weight: 6.17 lb / 2.8 kg


• Certification: FCC