Genuine OEM Audi HVAC vacuum hose, part number 8K0820620E. This hose is responsible for maintaining the necessary vacuum pressure within the climate control system to operate various actuators. It is routed within the heating and air conditioning assembly to ensure precise control of air distribution flaps. Genuine OEM parts are engineered with specific material resistance to heat and fluid exposure, ensuring a leak-free seal and correct routing geometry for long-term reliability.