Genuine OEM Audi Engine Coolant Pipe, part number 4L0121398. This vital component is responsible for transporting engine coolant throughout the cooling system, ensuring efficient heat dissipation and maintaining optimal engine operating temperatures. It is typically located within the engine bay, connecting various cooling system components. Weighing approximately 0.543 kg, this pipe is constructed from durable materials. Choosing a genuine OEM coolant pipe guarantees precise routing geometry, correct connection points, and resistance to thermal stress and corrosion, preventing leaks and cooling system failures.