Genuine OEM Volkswagen Upper Radiator Coolant Hose, part number 1K0122101LA. This critical hose is responsible for transporting hot coolant from the engine to the radiator, playing a vital role in the engine's temperature regulation system. It is positioned as the upper connection to the radiator. Weighing 0.74 kg, this hose features a complex molded shape with multiple branches and a fabric-wrapped section for durability. Using a genuine OEM coolant hose ensures the correct routing geometry, material composition for heat and pressure resistance, and secure connections to prevent leaks and maintain cooling system integrity.