Genuine OEM Audi Coolant Hose, part number 3D0122051AC. This hose is designed to carry engine coolant, playing a vital role in regulating engine temperature and preventing overheating. It connects within the engine cooling system, ensuring proper fluid circulation. Constructed from high-quality, heat-resistant rubber, it maintains flexibility and integrity under varying engine conditions. Choosing a genuine OEM hose ensures correct routing, secure connections, and long-term resistance to coolant chemicals and thermal cycling.