Genuine OEM Audi Coolant Hose, part number 1K0121156BF. This hose is a vital part of the engine cooling system, responsible for carrying coolant to and from various engine components to maintain optimal operating temperatures. It is positioned within the engine bay, connecting specific parts of the coolant circuit. Weighing 0.179 kg and measuring 0.31 m in length, this hose is constructed from durable, heat-resistant rubber. Using a genuine OEM hose ensures correct routing geometry, pressure resistance, and material compatibility with engine coolants, which are crucial for preventing leaks and maintaining cooling system integrity.