Genuine OEM Audi Engine Coolant Hose, part number 04L121058AN. This hose is designed to transport coolant efficiently between engine components, playing a critical role in the vehicle's thermal management system. It is a short, curved hose, approximately 7.5 cm long. Using a genuine OEM coolant hose ensures precise fitment, optimal flow characteristics, and resistance to temperature and pressure fluctuations, preventing leaks and maintaining engine health.