Genuine OEM Audi Engine Coolant Hose, part number 4KL121081A. This hose is a vital component of the engine cooling system, responsible for transferring coolant to maintain optimal engine operating temperatures. It connects directly to the expansion tank, ensuring proper fluid circulation. Measuring approximately 0.285 meters in length, this hose is engineered for precise fitment and long-term durability. Using a genuine OEM hose guarantees correct material specifications and resistance to thermal stress and pressure, preventing leaks and ensuring reliable cooling performance.