Radium Coolant Expansion Tank Kit, Honda Civic Type R (FK8 / FL5)

Radium Coolant Expansion Tank Kit, Honda Civic Type R (FK8 / FL5)

Application: Honda Civic Type R (2017+) and Acura Integra Type S (2024+)
Part Type: Billet aluminium coolant expansion tank kit
Part Number: 20-0827

Plastic coolant tanks have a reputation for failing over time under constant, intense heat cycling. The Radium 20-0827 replaces the Civic Type R's factory plastic tank with a two-piece CNC-machined aluminium tank, anodised for longevity, that is robust enough for racing and conducts heat better than plastic.

It fits without permanent modification: a custom bracket mounts to existing threaded holes and Radium adapter fittings connect to the factory coolant lines. Internal volume matches the OEM tank, and the two internal chambers are joined by cross-over passages at the top and bottom, with an internal swirl feature to help de-aerate the cooling system.

Key Features

• Two-Piece Billet Aluminium: CNC machined and anodised
• OEM Volume: Internal volume equivalent to the OEM tank, so no coolant capacity is lost
• Dual Chamber: Cross-over passages at the top and bottom
• Swirl De-Aeration: Internal swirl feature helps remove air from the system
• Bolt-In: Custom bracket uses existing threaded holes; adapter fittings connect to the factory lines
• Race Proven: Used in race and street vehicles worldwide

What's Included

• Two-piece billet aluminium tank
• Aluminium mounting bracket
• Aluminium adapter fittings
• Heater hose, 5/16in
• Overflow hose, 7/32in
• Stainless steel hardware

Important Notes

• The OEM 1.3 bar Honda pressure cap can be re-used
• Radium Type-A pressure caps with various pressure ratings are available separately
• Installation instructions are available in the Instructions tab

Vehicle Fitment

• Honda Civic Type R FK8 (2017–2021)
• Honda Civic Type R FL5 (2023+)
• Acura Integra Type S (2024+)

Not sure if this suits your vehicle? Email sales@coore.com.au and our team will confirm fitment.