Johnson Aqua Jet WPS 3.5 12V Water Pump 13L/min 2.8 Bar
10-13395-03
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Johnson Aqua Jet WPS 3.5 Pump
12V DC | 13L/min | 2.8 Bar Cut-Out | Five-Chamber
Johnson Pump 10-13395-03 is a serviceable five-chamber diaphragm pump for pressurised fresh-water systems. It delivers up to 13L/min and automatically cycles between approximately 1.7 bar cut-in and 2.8 bar cut-out.
Key Features
- ✔ Five-chamber diaphragm for smooth, quiet flow
- ✔ Built-in pressure switch and pulsation-dampening bypass
- ✔ Self-priming suction lift up to approximately 2m
- ✔ Santoprene diaphragm with EPDM valves
- ✔ Serviceable pump head
Technical Specs
| Model | Aqua Jet WPS 3.5 |
| Part number | 10-13395-03 |
| Voltage / power | 12V DC / 85W |
| Capacity | 13L/min / 3.5 US gpm |
| Cut-in / cut-out | Approx. 1.7 bar / 2.8 bar |
| Fuse size | 10A |
| Connections | 3/8in BSP or 1/2in hose; 1/2in BSP or 3/4in hose adaptor set |
| Maximum suction lift | Approx. 2m |
| Maximum liquid temperature | 50°C |
| Dimensions / weight | Approx. 237 × 210 × 117mm / 2.0kg |
Compatibility / Fitment Guide
| Check | Required specification | Decision |
|---|---|---|
| Supply | 12V DC with 10A circuit protection and wiring sized for motor load | Do not connect to 24V; choose 10-13395-04 for that system. |
| Water system | Pressurised marine/RV fresh-water supply | Not a bilge pump and not intended to pump fuel or sewage. |
| Pressure | Fixtures and pipework rated above 2.8 bar / 41psi | Confirm any water heater, filter and accumulator ratings. |
| Connections | Select supplied BSP/hose adaptor matching 1/2in or 3/4in plumbing | NPT-system variants carry different part numbers. |
| Suction | Lift ≤2m with airtight reinforced hose and upstream strainer | Air leaks and restrictions reduce priming and flow. |
Not suitable for: 24V supply, seawater/bilge/fuel/sewage service, liquid above 50°C, NPT replacement chosen solely by appearance or continuous-duty circulation.
Part Number Cross Reference
| Manufacturer | SPX FLOW Johnson Pump |
| Part number | 10-13395-03 |
| 24V BSP model | 10-13395-04 |
| 12V NPT model | 10-13395-103 |
| 4Boats SKU | 10-13395-03 |
Frequently Asked Questions
Is this the 24V pump?
No. It is the 12V model.
Does it stop automatically?
Yes. The pressure switch cuts out at approximately 2.8 bar and restarts near 1.7 bar.
Can it pump seawater?
This model is listed for pressurised fresh-water service, not raw-water or bilge duty.
Will it replace an NPT-port pump?
Not automatically. This SKU is the BSP/hose-adaptor version; verify the existing thread standard.
Before ordering: Check 12V supply, 10A fuse, BSP versus NPT plumbing, hose size, suction lift and 2.8-bar system rating.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
