Turbosmart GenV Cap (Black) is an efficient spare designed by Turbosmart that works with WG38/40. This Turbosmart cap offers a perfect fit and maximum performance to ensure an airtight seal while operating at high boost pressures. The Turbosmart GenV Cap (Black) also provides excellent protection against dust, dirt, and other contaminants as it is constructed using robust materials to provide superior durability for long-term reliability. Also, the Turbosmart cap features unique vents that allow for optimal pressure regulation and the release of any excess pressure after the operation has ceased. With the Turbosmart GenV Cap (Black), you can be sure that your WG38/40 will perform optimally under all conditions for years to come.