VTT BMW Billet Coolant Reservoir Cap

VTT BMW Billet Coolant Reservoir Cap

The VTT Billet Coolant Reservoir Cap replaces the factory plastic outer cap while retaining the original pressure-relief insert. The result is a durable billet exterior with the venting behavior of the compatible factory component.

Key Features

• CNC-machined 6061-T6 billet aluminum
• Accepts the factory pressure-relief insert
• Black, red, blue, and clear anodized finishes
• Matches other VTT billet engine-bay caps

Fitment

Direct replacement for compatible BMW cap/insert assembly 17117639020, used across many E-, F-, and G-Series vehicles, including N54, N55, N51/N52, N20/N26, B58, and S58 applications. Verify the original cap number and reservoir design before ordering.

Installation

Safety Note

Never open the cooling system while hot or pressurized. Inspect the transferred relief insert and cap seal before use and replace damaged factory components.

• Free US shipping on orders over $250.
• Free pickup at our Dallas shop, usually ready within 24 hours.
• Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
• Want it installed? Book the install at thegbmotors.com.

Full details are on our shipping and returns page.