Genuine OEM Volkswagen Water Radiator Hose, part number 5N0122051AS. This hose is located on the right side of the engine cooling system, responsible for carrying coolant to and from the radiator. Its robust construction and precise routing are vital for maintaining optimal engine temperature and preventing leaks. Choosing a genuine OEM hose ensures proper fitment, resistance to temperature extremes and pressure, and long-term reliability for the cooling system.