Genuine OEM Volkswagen Coolant Hose, part number 2H3121157A. This hose transports coolant between the engine and radiator to regulate engine temperature. It is located at position 11 in the engine cooling system diagram. Made from durable rubberized material to withstand high temperatures and pressures. Genuine OEM coolant hoses are specifically engineered with the correct internal diameter and wall thickness to ensure optimal coolant flow and prevent leaks, maintaining engine health.