Genuine OEM Audi Vacuum Hose, part number 2H0129456D. This critical hose is designed to transport air or fluid under vacuum conditions within the vehicle's engine system, supporting various functions such as brake boosting or emissions control. It is located in the engine bay, connecting multiple vacuum-operated components. Weighing 1.074 kg, this hose is engineered for specific routing and pressure resistance. Genuine OEM hoses ensure correct routing geometry, material composition, and resistance to engine fluids and temperatures for long-term reliability and system integrity.