Genuine OEM Audi Engine Coolant Hose, part number 03L121157AK. This critical component is responsible for transporting coolant between various engine components, playing a vital role in maintaining optimal engine operating temperatures. It is a small, curved hose, weighing approximately 0.03 kg and measuring about 0.08 meters in length. Opting for a genuine OEM coolant hose guarantees the correct material composition, heat resistance, and precise routing geometry for a leak-free and reliable cooling system.