Cap Expansion Tank (Topran) (BMW 1 Series F20/F21 / 3 Series F30 / X1 F48 / X5 E70 / X6 E71 / i3 / i8 / Mini 2005-2016) is a crucial component for your vehicle’s cooling system. This cap fits the expansion tank that manages coolant overflow and maintains proper pressure in the cooling circuit. It is designed for multiple BMW and Mini models from 2005 to 2016, covering popular platforms like the 1 Series, 3 Series, X1, X5, X6, as well as the i3 and i8 electric vehicles.
This cap is essential for ensuring the coolant remains within the tank under varying temperature and pressure conditions, which helps prevent overheating and coolant loss. When comparing this part to your old cap, ensure your vehicle matches the specified models and year range for compatibility. The physical design and sealing function are critical to maintain system integrity.
The cap is categorised under fuel tank components but serves the cooling system role in these vehicles. It is a direct replacement part from the Topran brand, recognised for manufacturing vehicle-specific components matching the listed BMW and Mini series. Checking the SKU BB-252220 will help confirm the part for your application.
- Fits BMW 1 Series F20/F21, 3 Series F30, X1 F48, X5 E70, X6 E71, i3, i8, and Mini models from 2005-2016
- Essential for maintaining coolant pressure and overflow control
- Topran branded replacement cap for expansion tanks
- Compare with existing cap for fit and specifications before purchase
Not sure the code, size or specification matches? Use more Fuel Tank or Request a Part with a clear photo of the old part before checkout.





