Genuine OEM Volkswagen Engine Coolant Hoses, part number 1J0121086AQ. This set of hoses is integral to the engine cooling system, responsible for carrying coolant between various engine components to regulate operating temperature. They are designed to withstand high temperatures and pressures within the cooling circuit. Made from robust, heat-resistant rubber, these hoses maintain flexibility and integrity over time. Using genuine OEM coolant hoses ensures correct routing, precise fitment, and resistance to degradation, critical for preventing leaks and maintaining engine health.