Genuine OEM Volkswagen Coolant Hose Line, part number 1S0122447G. This hose is an integral part of the engine cooling system, responsible for carrying coolant between components, specifically shown connecting to the coolant expansion tank. It ensures efficient circulation of coolant to maintain optimal engine operating temperatures. Measuring approximately 40 cm in length, this hose weighs 0.138 kg. Using a genuine OEM coolant hose ensures the correct material composition for resistance to heat and pressure, precise routing geometry, and proper connection points, all critical for preventing leaks and maintaining the integrity of the cooling system.