The MMR Performance 90mm billet coolant expansion cap for BMWs has been designed from the ground up in the UK, engineered from a solid billet of aluminium.

Each cap was designed to directly replace the OE cap, not merely a cover stuck in place. Fitment is for models with the matching OE (17 11 7 639 021) part number.

All MMR coolant caps arrive pre-sealed and pre-installed with an OE spec valve and internal spring. No need to remove the valve assembly from your OE cap. A true plug and play solution.

Features:

• Made of billet aluminum
• Replaces OE PN 17 11 7 639 021

What’s Included:

• MMX MMR BMW Coolant Cap 90MM