Genuine OEM Audi Lower Engine Coolant Hose, part number 4G0121448BD. This hose is designed to transport coolant efficiently within the engine cooling system, playing a critical role in heat management. It is positioned on the lower right side of the engine assembly, as indicated by the description and diagram. Weighing 0.0646 kg and measuring 0.165 m in length, it is engineered for precise fitment. Using a genuine OEM hose ensures correct routing, material integrity, and resistance to temperature and pressure fluctuations for reliable cooling performance.