SEAFLO 12V 1.2GPM 35PSI Water Pressure Pump 21 Series Marine RV

Compact low-flow on-demand pressure pump

A compact 12V diaphragm pump for one or two modest water outlets on boats, caravans and RVs. It supplies up to 1.2GPM at open flow and starts automatically when pressure falls, stopping at 35PSI when the outlet closes.

Technical specifications

Applications and compatibility

• For a galley tap, washbasin or small two-outlet 12V water system with moderate demand.
• Manufacturer guidance identifies the 21 Series for one to two fixtures, subject to plumbing losses and simultaneous use.
• Check that connected heaters, filters and taps accept a 35PSI system pressure.
• For clean compatible water only; do not pump fuel, oils, solvents or flammable liquids.

Installation and package contents

• Mount dry and ventilated on a stable surface using vibration isolation, with service access to the pressure switch.
• Fit an inlet strainer and airtight suction hose; connector style varies, so match the supplied ports to the plumbing.
• Protect the 12V circuit with cable and fuse sized for the 4A maximum draw and run length.
• Package contains one SEAFLO 21 Series pump. Verify exact port fittings and inlet strainer supplied before ordering.

Frequently asked questions

Can it supply two outlets?

It can supply one to two modest fixtures, although simultaneous flow depends on demand and pipework.

Does it run automatically when a tap opens?

Yes. The on-demand pressure switch starts and stops the pump.

Is 1.2GPM delivered at 35PSI?

No. The 1.2GPM figure is open flow; delivery decreases as pressure rises.

Can it run dry?

It tolerates brief dry running, but continuous dry operation should be avoided.