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Radium Engineering Coolant Expansion Tank

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$309.95 $294.45

Coolant expansion tanks are necessary for proper air bleeding in applications that utilize a rear mounted radiator or a low mounted radiator such as a V-Mount. However, expansion tanks are also valuable if integrated in a common radiator setup. To allow heat expansion, traditional coolant systems require air to be present in the top portion of the radiator during low temperatures. A coolant expansion tank permits the radiator to be 100% filled with coolant in all conditions. 

The Radium Coolant Expansion Tank holds 750mL. It is a 2-piece design constructed of CNC billet 6061 aluminum. The two halves (shown below) are bolted together along with a CNC billet aluminum radiator neck which accepts a standard 32mm "Mini" style pressure cap.

The coolant expansion tank features two internal chambers. These chambers are NOT isolated from each other. There is cross-over passages at the top and bottom. This product is not a coolant overflow tank. Instead, it is designed to part of the pressurized coolant system.

Threaded Ports

  • Side (Inlet): -6AN ORB (9/16"-18)
  • Bottom: -10AN ORB (7/8"-14)

The tank features three O-ring boss ports for a positive seal. Included are -6AN male adapter fittings (not tapered pipe threads). The lower ports are machined with 10AN ORB threads.The side port is machined with 6AN ORB threads. 


A laser cut black power coated laser cut mounting bracket is included.

Kit Includes

  • Billet Aluminum Coolant Tank
  • Anodized Aluminum Mounting Bracket 
  • 6AN Male Adapter Fittings (x3)
  • 6AN 90 degree Push-Lok Hose Ends (x3)
  • Nickel-Plated Fittings and Sight Tube 
  • Billet Aluminum 32mm Pressure Cap Receiver
  • Aluminum Pressure Bleed 1/4" Barb
  • Stainless Steel Hardware 

Pressure Caps

The optional Radium Engineering pressure caps (sold separately) allow the user to select a range of pressure. The purpose of a high pressure cap is to increase the boiling point in the cooling system providing improved cooling efficiency. Each cap is manufactured from stainless steel with a race proven high pressure valve. This is something to consider when tracking the vehicle in extreme conditions. 

  • Radium Pressure Cap - 1.1 Bar (110 kPA, 15.6 psi)
  • Radium Pressure Cap - 1.3 Bar (130 kPA, 18.9 psi)
  • Radium Pressure Cap - 1.5 Bar (150 kPA, 21.8 psi)

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