Genuine OEM Audi Engine Cooler Line, part number 4K0121081CR. This flexible line is an integral part of the engine cooling system, responsible for carrying fluid to and from the engine cooler. Weighing 0.049 kg, it is designed to withstand temperature fluctuations and fluid pressures. Using a genuine OEM cooler line ensures precise routing, correct material flexibility, and leak-proof connections, which is critical for maintaining optimal engine temperatures and preventing fluid loss.