Genuine OEM Audi Coolant Hose, part number 7M3122157D. This hose is specifically designed to transfer coolant to and from the heat exchanger, playing a vital role in the vehicle's heating and cooling system. Measuring 0.345 meters in length and weighing 0.271 kg, it ensures proper fluid circulation. Choosing a genuine OEM coolant hose guarantees the correct routing geometry, material resistance to temperature and pressure, and precise connection points, which are essential for preventing leaks and maintaining system efficiency.