Genuine OEM Audi Engine Coolant Pipe, part number 057121491AA. This rigid pipe is a critical component of the engine cooling system, responsible for transporting coolant to maintain optimal engine operating temperatures. It is typically located at the rear of the engine assembly. With a length of approximately 0.45 meters and weighing 0.092 kg, this pipe is engineered for durability. Choosing a genuine OEM coolant pipe guarantees the correct routing geometry, material composition for heat and pressure resistance, and leak-free connections, preventing costly engine damage.