Genuine OEM Audi Coolant Pipe, part number 3D0121065ER. This pipe directs coolant through the engine cooling system, playing a critical role in maintaining optimal engine operating temperature. It is a flexible component within the cooling circuit. Weighing approximately 0.27 kg and measuring about 0.33 meters in length, it is designed for precise fitment. Genuine OEM coolant pipes ensure correct routing geometry, material resistance to heat and pressure, and leak-free connections for long-term reliability.