Genuine OEM Volkswagen Coolant Hose, part number 5N0122101AC. This flexible hose is a vital part of the engine cooling system, responsible for circulating engine coolant between various components such as the radiator, engine block, and heater core. It ensures efficient heat transfer to prevent engine overheating. Measuring approximately 0.41 meters in length and weighing about 0.35 kg, it is designed for durability. Using a genuine OEM coolant hose guarantees the correct material composition, heat resistance, and precise routing, which are essential for preventing leaks and maintaining the integrity of the cooling system.