Genuine OEM Audi Engine Coolant Hose, part number 4N0121056AB. This critical component is responsible for transporting engine coolant, maintaining the engine's operating temperature. It is a short, curved hose, weighing approximately 0.037 kg. Using a genuine OEM hose ensures the correct material composition for resistance to heat and coolant chemicals, along with precise routing geometry for a leak-free and durable connection.