Genuine OEM Volkswagen Radiator Upper Coolant Hose, part number 5K0122101P. This essential hose assembly is responsible for circulating engine coolant to and from the radiator, playing a vital role in the engine's cooling system. It is positioned as an upper hose, connecting various components within the cooling circuit. Made from high-quality, heat-resistant rubber, it weighs approximately 0.55 kg. Using a genuine OEM coolant hose ensures the correct routing geometry, material resistance to heat and pressure, and reliable sealing to prevent leaks and maintain cooling system integrity.