SEAFLO 56A Series Variable-Speed 12V Water Pressure Pump — 5.0 GPM, 70 PSI, Self-Priming, Quiet Constant Pressure

The SEAFLO 56A Series is a 12V variable-speed water pressure pump delivering up to 5.0 GPM at 70 PSI with self-priming and intelligent constant-pressure control for RV, marine and camper freshwater systems.

This pump combines electronic variable-speed control, a durable five-chamber Santoprene diaphragm and corrosion-resistant materials to provide steady, quiet water delivery in mobile and compact installations. Certified to NSF, CE, RoHS and UL standards and supported by a four-year limited warranty, the SFDP1-050-070-56A is engineered to replace noisy cycling pumps with a smooth, efficient source of potable water on boats, RVs and remote cabins.

How does the variable-speed constant-pressure system improve everyday water use?

Instead of running at full speed and switching on/off, the pump modulates motor output to match real-time water demand. That means faucets, showers and appliances receive consistent pressure with fewer pressure spikes or drops, reducing stress on plumbing and fixtures.

• Maintains stable pressure up to 70 PSI for consistent flow.
• Variable-speed control reduces motor cycling and wear.
• Supports simultaneous use of multiple fixtures without major pressure loss.

Is this pump suitable for noisy or confined environments like cabins and berths?

Yes — the 56A Series integrates bypass technology and refined diaphragm design to minimize vibration and audible noise. Quiet operation is prioritized so the pump can sit near living spaces without creating disturbance.

• Bypass reduces surging and pump noise during variable loads.
• Five-chamber diaphragm evens out pulses for smoother delivery.
• Compact footprint fits under sinks, lockers or equipment bays.

What installation and safety features should I expect for marine and RV use?

• Self-priming up to 6 ft for flexible mounting positions.
• Run-dry capability protects the pump during low-water events.
• EPDM valves and Santoprene diaphragm for potable water compatibility.
• Quick-attach ports for faster plumbing connections and maintenance.

Will this pump meet the electrical and performance needs of my system?

The SEAFLO 56A runs from a 12V DC supply and draws a maximum of about 10 amps under load, making it appropriate for most RV and marine battery systems when properly fused. It offers up to 5.0 GPM (18.9 LPM) and a 70 PSI shut-off, balancing flow and pressure for showers, sinks and small appliances.

• 12V DC operation with max draw ~10 A for battery-powered systems.
• 5.0 GPM (18.9 LPM) flow rate for typical freshwater needs.
• 70 PSI shut-off provides higher pressure capability when required.
• Maximum fluid temperature rating up to 140°F for hot water tolerance.

Who is this for: The SEAFLO 56A Series suits RV owners, boaters, yacht fitters, camper converters and off-grid homeowners who need a reliable, quiet and efficient freshwater pump. It’s ideal when consistent pressure, self-priming capability and durable construction matter — especially in installations where noise, space and long-term reliability are important. Backed by SEAFLO’s four-year limited warranty and certifications (NSF, CE, RoHS, UL), this pump is designed for potable water systems demanding dependable performance.