COOLANT TANK CAP MPI ALLOY WOOD & PICKETT – WP25073
The WP Mini MPI Expansion Coolant Tank Cap Cover is a CNC‑machined aluminium accessory engineered to enhance both the durability and appearance of the factory coolant expansion tank cap. Manufactured from high‑grade billet aluminium, the cover is precisely turned and milled to ensure a tight, secure fit over the original cap used on 1996–2000 Multi‑Point Injection (MPI) Mini models.
The component typically features:
- Material: High‑grade billet aluminium for strength, corrosion resistance, and thermal stability.
- Manufacturing: CNC machining for consistent tolerances, clean edges, and a uniform surface finish.
- Fitment: Designed to slip over or replace the OEM plastic expansion tank cap on Classic Mini MPI coolant reservoirs without modifying the tank.
- Surface Finish: brushed, to improve corrosion resistance and aesthetics.
- Design Features:
- Knurled or ribbed outer surface for improved grip during removal
- Precision‑cut internal geometry for secure seating
- Laser‑etched or engraved markings
- Function:
- Enhances the visual appearance of the engine bay
- Provides improved durability compared to ageing plastic caps
- Maintains proper sealing when paired with the original pressure‑rated cap beneath (if designed as a cover)
Application and Compatibility
- Vehicle: Classic Mini Cooper MPI (1996–2000)
- System: Coolant expansion/overflow tank
- Installation: Tool‑free fitment in most cases; simply press into place depending on design
- Performance Considerations:
- Does not alter the pressure rating of the cooling system
- Designed to withstand engine‑bay temperatures and coolant vapour exposure










