Johnson 2L Accumulator Tank 15mm 1/2in Hose 0.8 Bar
10-1331
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Johnson Pump 2L Accumulator Tank
Fresh-Water Pressure System | 15mm / 1/2in Hose | Pre-Charged
This 2-litre Johnson Pump accumulator stores a small pressurised water reserve between a pressure-switched pump and outlets. It smooths flow, reduces rapid pump cycling and can lower noise and battery consumption in a compatible marine or mobile fresh-water system.
Key Features
- ✔ 2L / 0.5 US gallon capacity
- ✔ Pre-charged to approximately 0.8 bar / 12psi
- ✔ Mounts in any orientation
- ✔ Reduces pressure pulsation and pump cycling
- ✔ Mounting retainer supplied
Technical Specs
| Capacity | 2L / 0.5 US gal |
| Connections | 15mm / 1/2in hose tails |
| Factory pre-charge | Approx. 0.8 bar / 12psi |
| Dimensions | Approx. 315mm high × 160mm diameter |
| Weight | Approx. 1.2kg |
| Tank type | Diaphragm accumulator |
| Installation | Pressure-switched pumped-water system |
| 4Boats SKU | 10-1331 |
| Johnson family references | 09-36572-01 / later 09-46839-01 references are found for 1/2in versions |
Compatibility / Fitment Guide
| Check | Required specification | Decision |
|---|---|---|
| System type | Fresh-water pump controlled by a pressure switch | Install downstream of the pump where it can absorb pressure fluctuations. |
| Connection | 15mm / 1/2in flexible hose | Use the separate 19mm model if the existing hose is 3/4in. |
| Pressure | System pressure below the rating printed on the supplied tank | Published revisions vary; the physical tank label is the controlling limit. |
| Pre-charge | Set with water side depressurised, normally just below pump cut-in per pump manual | Do not adjust while the water side remains pressurised. |
| Service access | Space for 315 × 160mm tank, bracket, hose bends and air-valve access | Mount securely in any orientation and protect against corrosion/freezing. |
Not suitable for: hot-water expansion duty unless the exact tank label permits it, pressure above the tank label, direct connection to mains water without regulation, wrong hose size or use with a ruptured diaphragm.
Part Number Cross Reference
| 4Boats / Aquafax SKU | 10-1331 |
| Connection variant | 15mm / 1/2in hose |
| Johnson legacy reference | 09-36572-01 |
| Later Johnson reference seen for 1/2in tank | 09-46839-01 |
| 19mm alternative | 10-1332 / 09-36572-02 family — different hose size |
Frequently Asked Questions
Will it make the pump more powerful?
No. It smooths flow and reduces cycling; it does not increase the pump’s maximum pressure or flow.
Can it be mounted horizontally?
Yes. Johnson specifies mounting in any position, provided the tank and hose are secured.
How do I set the air pressure?
Depressurise and drain the water side, then set pre-charge to the value required by the pump manual, commonly just below cut-in.
Is this the 3/4in version?
No. SKU 10-1331 uses 15mm / 1/2in hose connections.
Before ordering: Confirm hose size, pump cut-in pressure, tank-label pressure limit, pre-charge procedure and available service access.
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