Genuine OEM Audi HVAC Heater Hose, part number 4E0819371M. This hose is responsible for circulating hot coolant to the heater core, which is essential for providing warmth to the vehicle's cabin. The product image shows it features a protective silver heat-resistant sleeve, indicating its exposure to high temperatures. Weighing 0.2535 kg and measuring 0.445 m in length, it is designed for specific routing and thermal demands. Choosing a genuine OEM heater hose ensures proper material composition for high-temperature resistance and pressure integrity, preventing leaks and maintaining effective cabin heating.