MMR 90mm Billet Coolant Cap for BMW

The MMR Performance 90mm billet coolant expansion cap for BMWs is crafted from a solid billet of 6061 aerospace-grade aluminium, designed and engineered in the UK.

Each cap is meticulously machined using advanced CNC 5-axis technology, polished, and gloss-anodised for durability and aesthetic appeal.

All MMR coolant caps come pre-sealed and pre-installed with an OE spec valve and internal spring, providing a true plug-and-play solution without the need to remove the valve assembly from your OE cap.

Featuring a deep gloss black anodised finish, this cap enhances the under-bonnet appearance of your BMW while ensuring reliable performance. The design includes ample surface grip for easy installation and coolant filling.

Features

• Crafted from 6061 aerospace-grade aluminium
• Full OE cap replacement, not just a cover
• Sophisticated internal springing and bleed off
• Anodised in gloss black
• Pre-installed factory spec Viton O-Ring

Additional Information

Excessive heat for prolonged periods may affect the finish of anodised aluminium products.

Vehicle Fitment

• All BMW with matching 17 11 7 639 021 OE part number