Genuine OEM Audi Coolant Hose, part number 420121082B. This flexible hose is designed to convey coolant efficiently within the engine cooling system, playing a critical role in maintaining optimal engine operating temperature. It connects various components of the cooling circuit, often found in the lower section of the engine bay. Weighing approximately 0.45 kg and measuring 0.435 m in length, this hose is constructed from durable, heat-resistant materials. Choosing a genuine OEM coolant hose ensures precise fitment, correct routing geometry, and resistance to thermal cycling and coolant chemicals, preventing leaks and premature failure.