Genuine OEM Audi Engine Coolant Overflow Hose, part number 8K0121081BA. This hose is a vital part of the engine cooling system, specifically designed to direct excess coolant safely to the overflow reservoir. It helps maintain optimal system pressure and prevents coolant loss, which is crucial for engine temperature regulation. This hose is typically located at the front of the engine bay. Made from durable, heat-resistant rubber with integrated quick-connect fittings, it weighs approximately 0.0253 kg. Choosing a genuine OEM overflow hose ensures precise routing, correct material properties, and reliable connections for a leak-free and efficient cooling system.