Genuine OEM Audi Engine Coolant Pipe, part number 057121131B. This pipe is crucial for directing coolant flow within the engine cooling system, maintaining optimal engine operating temperatures. It is a precisely formed metal pipe, weighing approximately 0.176 kg and measuring 0.22 meters in length. Choosing a genuine OEM coolant pipe ensures the correct routing geometry, material integrity, and resistance to thermal stress and corrosion, preventing leaks and maintaining cooling system efficiency.