Genuine OEM Audi Engine Vacuum Hose, part number 0P2131611L. This hose is a crucial component within the engine's vacuum system, responsible for transporting air or fluids to facilitate various engine and emissions control functions. It is positioned as part of a network of lines connected to vacuum pumps and canisters. Made from flexible, durable material, it is designed to maintain a tight seal under vacuum conditions. Using a genuine OEM vacuum hose ensures the correct internal diameter, flexibility, and resistance to degradation, which are critical for maintaining proper vacuum levels and preventing leaks in the system.