Genuine OEM Audi HVAC Heater Hose, part number 8R0819376T. This critical hose is responsible for circulating engine coolant to the vehicle's heating system, providing warmth to the cabin. It is a precisely molded rubber hose, approximately 46.5 cm long, designed to withstand temperature fluctuations and pressure. Using a genuine OEM heater hose ensures correct routing, leak-free connections, and resistance to coolant chemicals for long-term reliability of the heating and cooling system.