Genuine OEM Audi Engine Coolant Hose, part number 4K0265357B. This hose is a critical component of the engine cooling system, responsible for circulating coolant to maintain optimal engine operating temperatures. It is typically found connecting various components within the cooling circuit, such as a valve or heat exchanger. Made from durable, heat-resistant reinforced rubber, it measures approximately 125mm long. Using a genuine OEM coolant hose ensures the correct routing, material integrity, and resistance to the high temperatures and pressures of the cooling system, preventing leaks and potential engine damage.