Genuine OEM Volkswagen Coolant Hose, part number 1K0121447DJ. This hose transports coolant between engine components and the radiator to regulate engine temperature. It is located at position 11 in the engine cooling system assembly. Constructed from durable rubber and designed for precise fitment, this component ensures efficient heat exchange. Genuine OEM coolant hoses are manufactured to strict tolerances, guaranteeing correct flow rates and resistance to heat and pressure for long-lasting, reliable engine cooling.