Radium Engineering Coolant Expansion Tank
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Radium Engineering Universal Coolant Tank, 1240mL
Radium Engineering builds motorsport grade coolant system components in the USA to tight tolerances, and this Universal Coolant Tank is a billet aluminium expansion tank built for pressurised cooling systems running rear mounted or low mounted radiators such as V-Mount setups. SKU 20-2270.
This listing covers the 1240mL tank only, suited to any application needing a dedicated coolant expansion tank rather than a simple overflow bottle. Pressure caps are sold separately in 1.1 Bar, 1.3 Bar and 1.5 Bar options via the selector on the listing page, so pick the rating that matches your cooling target.
Note: this is not an overflow tank. It must be plumbed as part of a pressurised coolant system and does not include a pressure cap.
Specifications
- Capacity: 1240mL
- Billet 6061 aluminium tank with anodised aluminium mounting bracket
- Water level window height: 118mm (4.6 in)
- 6AN ORB top inlet port for natural bleed
- 10AN ORB bottom drain outlet, typically run to water pump suction side
- Secondary 10AN ORB port for high point air bleed, where applicable
- Barbed overflow/purge port
- Type-A pressure cap receiver (cap sold separately)
- Stainless steel hardware included
Port sizing, bracket dimensions and installation notes are provided in the tabs above. Please confirm your cooling system layout and hose fitment before ordering.
Not sure if this tank suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.
Vehicle Compatibility
Universal fitment — verify dimensions before ordering.
Technical Specifications
| Spec | Value |
|---|---|
| Capacity | 1240 mL |
| Construction | Multi-piece design, CNC billet 6061 aluminium |
| Internal Chamber Design | Two internal chambers, not isolated, with cross-over passages at top and bottom |
| Mounting Bracket | Anodised aluminium |
| Water Level Window Height | 118 mm (4.6 in) |
| Pressure Cap Receiver | Type-A (radiator style), cap sold separately |
| Pressure Bleed Fitting | Aluminium, 1/4 in barb |
| Hardware | Stainless steel |
| Top Port (Inlet) | 6AN ORB (9/16"-18) |
| Bottom Port (Drain Outlet) | 10AN ORB (7/8"-14) |
| Secondary Bottom Port | 10AN ORB (7/8"-14) |
| Overflow/Purge Port | Barbed cap fitting |
| Compatible Pressure Cap Range (sold separately) | 1.1–1.5 Bar (110–150 kPa) |
No instructions available for this product.

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