Genuine OEM Audi Return Coolant Hose, part number 7L6819196B. This critical hose is part of the engine cooling system, responsible for carrying cooled fluid from the radiator or other cooling components back to the engine. It ensures the engine maintains its optimal operating temperature, preventing overheating. Made from reinforced rubber, it measures approximately 350mm in length. Using a genuine OEM hose guarantees the correct routing geometry, material resistance to heat and coolant chemicals, and proper sealing, which are vital for a reliable and leak-free cooling system.