Genuine OEM Audi air intake drain hose, part number 4E0133606. This hose is designed to facilitate the drainage of moisture or condensation from the air intake housing, preventing water buildup that could affect engine performance. It is located within the air intake assembly as illustrated in the diagram. Genuine OEM hoses are engineered with the correct material resistance and routing geometry to ensure a secure, leak-free connection and long-term durability in the engine bay environment.