Genuine OEM Kia Engine Coolant Overflow Hose, part number 25450G2700. This hose is a vital part of the engine cooling system, designed to safely direct excess coolant from the expansion tank or radiator to prevent over-pressurization. It ensures the cooling system can manage thermal expansion effectively. Using a genuine OEM hose guarantees the correct material flexibility, heat resistance, and precise routing, which are essential for preventing leaks and maintaining proper coolant system function.