Genuine OEM Volkswagen Coolant Hose, part number 1K0121063AE. This hose is essential for transporting coolant between engine components, playing a critical role in regulating engine temperature. It is located at position 17 within the cooling system assembly. The precise dimensions and material composition of genuine OEM hoses ensure they withstand the high pressures and temperatures of the cooling system, preventing leaks and maintaining optimal engine performance.