Genuine OEM Audi Engine Coolant Breather Hose, part number 06M121692AC. This flexible hose is a crucial component in the engine cooling system, specifically designed to allow trapped air to escape, ensuring proper coolant circulation and preventing airlocks. Positioned at the rear, it measures approximately 0.565 meters in length and weighs 0.042 kg. Using a genuine OEM breather hose guarantees the correct material flexibility, routing, and resistance to thermal cycling, which are essential for maintaining optimal engine temperature and preventing cooling system malfunctions.