Genuine OEM Audi Engine Coolant Hose, part number 4K0122157C. This hose is a key component in the engine cooling system, responsible for transporting coolant between various engine components and the radiator. It is positioned within the complex network of cooling lines. Constructed from durable, heat-resistant rubber, it maintains integrity under varying temperatures and pressures. Using a genuine OEM hose guarantees correct routing, precise fitment, and resistance to coolant chemicals, preventing leaks and ensuring efficient engine cooling.