Genuine OEM Mini Upper Radiator Coolant Hose, part number 17128625400. This hose transports coolant between the engine and the radiator, playing a crucial role in maintaining optimal engine temperature. It is constructed from high-quality, heat-resistant materials designed to withstand the pressures and temperatures of the cooling system. Genuine OEM coolant hoses are engineered for precise fitment and long-term durability, ensuring reliable engine cooling.