SEAFLO 41 Series 24V 3.3GPM 35PSI Water Pressure Pump
DP203303541
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Automatic pressure water supply for boats and mobile systems
The SEAFLO SFDP2-033-035-41 is a 24V DC four-chamber diaphragm demand pump delivering up to 3.3 GPM (12.5 L/min) with a 35 PSI shut-off setting. It automatically starts when a tap opens and stops when the system repressurises.
It is intended for freshwater pressure systems in boats, yachts, cabins and suitably wired mobile installations, typically supplying up to three fixtures. The internal bypass helps reduce cycling at low flow, so an accumulator is not normally essential for a correctly configured system.
Performance and design features
- Four-chamber diaphragm for smooth flow and reduced pulsation.
- Automatic pressure switch for on-demand operation.
- Internal bypass reduces rapid switching during small water demand.
- Self-primes up to approximately 1.8 m suction lift.
- Run-dry capable for accidental dry operation; not intended for deliberate prolonged dry running.
- Quick-attach ports simplify installation and winterisation.
- Rubber mounting feet help isolate vibration.
- Suitable for fresh or salt water within the stated material and temperature limits; flush after salt-water service.
Technical specification
| Manufacturer model | SFDP2-033-035-41 |
| Supply voltage | 24V DC |
| Open flow | 3.3 GPM / 12.5 L/min |
| Shut-off pressure | 35 PSI / 2.4 bar |
| Maximum current draw | 4.48 A |
| Pump type | Four-chamber diaphragm demand pump |
| Self-priming lift | Up to 1.8 m (6 ft) |
| Ports | SEAFLO quick-attach type |
| Maximum recommended liquid temperature | 60°C (140°F) |
| Valve material | EPDM |
| Diaphragm material | Santoprene |
| Wiring | 16 AWG leads, approximately 114 mm |
| Approximate dimensions | 320 × 120 × 110 mm |
| Approximate unit weight | 1.77 kg |
Compatibility and installation checks
- Confirm a 24V DC electrical supply and size the fuse, switch and cable for the 4.48 A maximum draw and cable length.
- Suitable for compact boat or cabin pressure-water systems with approximately one to three fixtures, subject to simultaneous demand and plumbing losses.
- Confirm the existing pipework accepts the SEAFLO quick-attach port system; adapters may be required when replacing another brand.
- Install an inlet strainer, use flexible hose near the pump, mount it in a dry ventilated service area and keep the suction line airtight.
- All taps, heaters, filters, accumulators and fittings must tolerate at least 35 PSI and the installation's maximum temperature.
- Not a submersible bilge pump and not suitable for fuel, oil, sewage or abrasive liquids.
- Package: one 41 Series pressure pump. Confirm pictured port fittings; strainer, hose, fuse and main wiring may be separate installation items.
Frequently asked questions
Will it start when a tap opens?
Yes. The integrated pressure switch provides automatic on-demand operation.
Does it require an accumulator tank?
Normally no for a correctly designed system, although a compatible accumulator can further smooth flow and reduce cycling.
Can it replace any 24V water pump?
No. Compare flow, pressure, maximum current, port type, dimensions and mounting pattern before ordering.
Can I use it as a bilge pump?
No. It is a diaphragm pressure pump and must not be submerged.
For the products under £150 the shipping is £6.99.
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