Genuine OEM Mini Upper Radiator Hose, part number 17127515989. This hose carries coolant between the engine and radiator, playing a crucial role in maintaining optimal engine operating temperatures. It is positioned at the top of the cooling system, connecting the engine block to the radiator. Constructed from durable, heat-resistant rubber, this hose is designed to withstand the pressures and temperatures of the cooling system. Genuine OEM hoses are engineered for precise fitment and long-term reliability, preventing leaks and ensuring efficient heat transfer.