Genuine OEM Audi Coolant Hose, part number 420121444B. This flexible hose is designed to connect various components within the engine's cooling system, facilitating the transfer of coolant to maintain optimal engine operating temperatures. It is positioned as part of the complex network of cooling lines. Weighing 0.43 kg, this hose is engineered from high-quality, heat-resistant materials. Choosing a genuine OEM coolant hose guarantees precise dimensions, correct routing, and superior resistance to thermal cycling and chemical degradation, which are essential for preventing leaks and ensuring the long-term reliability of the cooling system.