Genuine OEM Audi Engine Coolant Hose, part number 4K0819374R. This hose is a critical component of the engine cooling system, responsible for transporting coolant between various engine components to regulate temperature. Its specific molded shape and dimensions (0.145m L, 0.05m W, 0.045m H) ensure correct routing and fitment. Using a genuine OEM hose guarantees the correct material composition for resistance to heat, pressure, and coolant chemicals, preventing leaks and ensuring efficient engine cooling.