Genuine OEM Audi Coolant Hose, part number 3D0122157AA. This hose is an essential component of the engine cooling system, responsible for circulating coolant to regulate engine temperature and prevent overheating. It is integrated into the complex network of coolant lines. Weighing approximately 0.161 kg, this hose is designed for durability and resistance to thermal cycling. Choosing a genuine OEM coolant hose ensures the correct material composition, precise routing, and secure connections, preventing leaks and maintaining the integrity of the entire cooling system.