Genuine OEM Audi Coolant Hose, part number 4H0121055AB. This hose is designed to circulate coolant between components of the engine cooling system, maintaining optimal operating temperatures. It features a quick-release coupling for secure and efficient connection, typically connecting to the radiator. Weighing 0.447 kg and measuring approximately 0.51 meters in length, this hose is engineered for precise fitment and durability. Choosing a genuine OEM coolant hose ensures the correct routing geometry, material composition, and pressure resistance for reliable, leak-free performance and long service life.