Genuine OEM Audi Engine Radiator Coolant Hose, part number 8D0121101AG. This critical component is responsible for transporting hot coolant from the engine to the radiator and cooled coolant back to the engine, maintaining optimal operating temperatures. It is specifically molded to ensure correct routing and fitment within the engine bay. Constructed from durable, heat-resistant rubber and reinforced for pressure, it weighs approximately 0.398 kg. Using a genuine OEM coolant hose ensures resistance to extreme temperatures and pressures, preventing leaks and maintaining the integrity of the engine cooling system.