Genuine OEM Audi Alternator Coolant Supply Hose, part number 8E0121086A. This hose is specifically engineered to transport coolant to or from the alternator, facilitating its cooling and preventing overheating. It is typically located on the right side of the engine bay. Constructed from high-quality, heat-resistant rubber and reinforced with textile braiding, it maintains flexibility and integrity under varying temperatures and pressures. Using a genuine OEM hose guarantees the correct internal diameter, precise bends, and material composition, which are crucial for preventing leaks, maintaining proper coolant flow, and ensuring the longevity of the cooling system.