Genuine OEM Volkswagen Coolant Hose, part number 06K121059D. This hose is a key component in the engine's cooling system, responsible for the circulation of coolant to maintain the correct operating temperature. It connects various parts of the cooling system, such as the engine block, radiator, and thermostat housing. The hose measures 0.115 meters in length, 0.075 meters in width, and 0.025 meters in height. Genuine OEM coolant hoses are manufactured with specific material properties to resist heat, pressure, and degradation, ensuring the longevity and efficiency of the cooling system.