This thermostat cover and connecting sleeve, part number 06E121168B, is designed for installation on Q5, A4, S4, A5, S5, A6, S6, A7, A8, and S8 models.The unit serves as a direct replacement to restore the cooling system configuration.Constructed from materials, it provides resistance against standard automotive chemicals and operating conditions.The design allows for straightforward installation without requiring professional assistance.This component is manufactured without restricted substances to meet environmental standards.It functions to maintain engine temperature regulation consistent with factory specifications.