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The Mishimoto aluminum expansion tank for 2013–2018 Ford Focus ST and 2016–2018 Focus RS replaces the plastic reservoir with TIG‑welded aluminum for greater durability and improved engine‑bay styling. Internal baffles reduce coolant sloshing during aggressive driving, and an integrated sight tube simplifies level checks. Reuses the stock cap, includes an overflow nipple for an auxiliary tank, installs in under an hour, and carries Mishimoto’s Lifetime Warranty.
Mishimoto 2013+ Ford Focus ST/2016+ Focus RS Aluminum Expansion Tank - Black
