Genuine OEM Audi Engine Coolant Hose, part number 04L121157C. This critical component is designed to transport engine coolant efficiently throughout the cooling system, ensuring optimal engine operating temperature. It is a curved hose, as shown in the diagram. Made from high-quality, heat-resistant rubber, this hose weighs approximately 0.028 kg. Using genuine OEM hoses guarantees the correct material composition, routing geometry, and pressure resistance, which are vital for preventing leaks and maintaining the integrity of the cooling system.