Genuine OEM Audi Coolant Hose, part number 05L121157AQ. This hose is designed to transport coolant within the engine's thermal management system, crucial for regulating engine temperature and preventing overheating. It is positioned as a component in the engine cooling circuit, connecting to other fluid-carrying parts. Weighing 0.1 kg and measuring approximately 15 cm in length, it is engineered for specific routing and pressure. Choosing a genuine OEM hose ensures the correct material composition and precise routing geometry, preventing leaks and maintaining system integrity under thermal stress.