Genuine OEM Audi Engine Coolant Pipe, part number 4K0121070AB. This pipe is a critical component of the engine cooling system, responsible for transporting coolant between various components like the radiator and engine. It ensures efficient heat exchange to maintain optimal engine operating temperatures. Weighing approximately 0.639 kg, this pipe measures 0.69 m in length. Genuine OEM coolant pipes are engineered for precise routing geometry, correct material composition, and resistance to high temperatures and pressures, preventing leaks and ensuring system integrity.