SEAFLO 21 Series 12V 1.1GPM 70PSI High Pressure Water Pump

Compact high-pressure demand pump for one or two outlets

The SEAFLO SFDP1-011-070-21 is a compact 12V DC diaphragm demand pump rated at 1.1 GPM (4.2 L/min) open flow with a 70 PSI shut-off setting. The built-in pressure switch starts automatically when an outlet opens and stops after the system repressurises.

Its combination of moderate flow and high pressure suits compact boat and RV systems, spraying, liquid transfer, circulation, filtration and dispensing where every downstream component is rated for 70 PSI.

Performance and design features

• Automatic on-demand pressure switch with adjustable setting.
• Compact diaphragm design capable of supplying one or two low-demand fixtures.
• Self-primes up to approximately 1.2 m suction lift.
• Run-dry capable for accidental loss of supply; prolonged deliberate dry operation should be avoided.
• Quiet intermittent-duty operation.
• Ignition-protected motor construction.
• Industry-standard mounting pattern and long 18 AWG leads.
• Designed to meet or exceed RoHS, SGS and ISO requirements.

Technical specification

Compatibility and installation checks

• Use with a 12V DC supply and protect the circuit for the 4 A published maximum draw.
• All hoses, taps, filters, valves and fittings must tolerate at least 70 PSI; many basic caravan fittings are lower-rated.
• Confirm the supplied port style and hose bore before replacing another pump.
• Install an inlet strainer, keep the suction side airtight and mount the pump in a dry ventilated service location.
• Best suited to one or two low-demand outlets; it is not a high-volume shower pump.
• Not submersible and not suitable for bilge water, fuel, oil, sewage or abrasive liquids.
• Package: one 21 Series pump. Confirm pictured connectors; strainer, hose, fuse and main wiring may be separate.

Frequently asked questions

Does it start when an outlet opens?

Yes. The integrated pressure switch provides automatic on-demand operation.

Can it supply a shower?

Its 4.2 L/min flow is generally too low for a normal shower; it is intended for compact or spraying applications.

Can it replace any 12V pump?

No. Compare flow, 70 PSI pressure, current, ports, dimensions and downstream component ratings.

Can it be installed inside a water tank?

No. It is a dry-mounted diaphragm pump and must not be submerged.