Genuine OEM Audi Radiator Pipe Hose, part number 4L0122101B. This essential component carries coolant between the engine and the radiator, playing a critical role in the vehicle's thermal management system. It is installed on the right side of the engine cooling assembly. The hose measures 320mm in length, 220mm in width, and 98mm in height. Choosing a genuine OEM radiator hose ensures correct routing geometry, material composition, and resistance to temperature and pressure, preventing leaks and premature failure.