Surejust 5L Accumulator & Expansion Tank with Fittings - Marine Boat RV SJ-ACC5
9-40307
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Surejust 5L Accumulator Tank (SJ-ACC5)
Premium Pressure Stabilization for Marine & RV Systems
The Surejust 5-Litre Accumulator Tank is an essential component for any pressurized water system on boats, yachts, and motorhomes. By providing a pressurized buffer of water, it prevents the water pump from constantly "hunting" (rapidly switching on and off), which significantly reduces noise and extends the service life of your pump.
This versatile unit doubles as an expansion tank when installed on the hot water side of a system (after the calorifier), absorbing the thermal expansion of water as it heats to prevent unnecessary pressure relief valve (PRV) venting. Manufactured in the UK, it features high-quality internal diaphragms and a robust outer shell.
Key Features
- ✔ Dual-Purpose: Works as an accumulator or expansion tank.
- ✔ Complete Kit: Includes mounting bracket and 13mm hose tail fittings.
- ✔ Smooth Flow: Eliminates water hammer and pump pulsation.
- ✔ Pre-Pressurized: Ready to install with 19 PSI (1.3 Bar) factory charge.
Technical Specs
| Capacity: | 5 Litres (1.3 Gallons) |
| Max Pressure: | 112 PSI (7.7 Bar) |
| Factory Pre-charge: | 19 PSI (1.3 Bar) |
| Thread Connection: | 1/2" BSP Male |
| Dimensions: | 380mm (H) x 170mm (W) |
| Weight: | 2.5kg (Approx) |
Compatibility / Fitment Guide
| Application | System Type | Notes |
|---|---|---|
| Marine & Boat | Pressurized Water Systems | Suitable for Narrowboats, Yachts, and Cruisers. |
| RV & Campervan | 12V/24V Demand Pumps | Compatible with Shurflo, Jabsco, and Flojet pumps. |
| Hot Water Expansion | Calorifiers (22L - 55L) | Protects water heaters from pressure expansion. |
OEM Cross Reference
| Surejust Part Number | SJ-ACC5 / ACC5 / EXP5 |
| Alternative Refs | 520605, 9-40307 |
Questions & Answers
Is this a genuine original part?
Yes, this is an authentic Surejust (SureCal) product, manufactured to high standards in the United Kingdom.
How do I know if it is compatible?
Check your existing water pump or tank for the SJ-ACC5 or ACC5 part number. This 5L model is the standard choice for boat calorifiers between 22 and 55 litres capacity.
Can I adjust the internal pressure?
Yes, there is an integrated Schrader valve (standard tyre valve) that allows you to increase or decrease the pre-charge pressure to match your specific pump's cut-in pressure.
Note: Please verify your original part number and system capacity against the references above before purchasing. All technical data is sourced from official Surejust technical documentation.
Available at 4boats.co.uk
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