Genuine OEM Audi Radiator Upper Coolant Hose, part number 8R0121101T. This molded hose is designed to carry coolant between the engine and the radiator, playing a vital role in maintaining optimal engine operating temperature. It is positioned as the upper connection in the cooling circuit. Genuine OEM hoses are constructed from durable, heat-resistant rubber, ensuring precise fitment, flexibility, and leak-free performance under the demanding conditions of the engine bay.