Genuine OEM Audi Ventilation Hose Assembly, part number 06A133789. This multi-branch hose assembly is crucial for managing engine ventilation, directing crankcase gases or vacuum to various engine components. It ensures proper pressure regulation within the engine and contributes to emissions control. Made from durable, heat-resistant rubber and plastic, it is designed for precise routing and connection. Choosing a genuine OEM hose guarantees correct fitment, material integrity, and long-term resistance to engine fluids and temperatures, preventing leaks and maintaining system performance.