Radium Engineering Coolant Tank Kit – Focus ST 13–18 / Focus RS 16–18

This Radium Engineering coolant expansion tank is a direct replacement for the plastic OEM coolant tank found in the front-right corner of the engine bay on the 2013–2018 Ford Focus ST and Focus RS. With improved durability and thermal performance, this billet aluminum tank also increases system capacity by an additional 160mL.

Vehicle Compatibility:

• 2013–2018 Ford Focus ST

• 2016–2018 Ford Focus RS

Key Features:

• CNC-machined aluminum two-piece design, bolted together

• Increased coolant volume (+160mL over OEM)

• Internal swirl feature aids in deaeration and system stability

• Dual internal chambers with top and bottom crossover passages

• Direct fit – no permanent modifications required

• Significantly more robust than factory plastic tank

• Ideal for street and track use

Note:

• Coolant pressure cap is sold separately

• Compatible with Radium Type-A caps or the OEM Ford cap

A sleek, performance-ready solution to a common failure point in modified Focus ST and RS vehicles.