Genuine OEM Audi Lower Engine Coolant Pipe, part number 4H0121400AD. This rigid pipe is essential for circulating coolant to regulate engine temperature. It is positioned on the lower left side of the engine cooling system. Weighing 0.177 kg and measuring 0.515 m in length, it is designed for precise fitment. Genuine OEM pipes ensure correct routing geometry and material integrity for leak-free and reliable coolant flow.