Genuine OEM Audi Water Coolant Hose, part number 1K0121058BG. This component is crucial for transporting coolant within the engine cooling system, maintaining optimal operating temperatures. It is a curved black rubber hose, weighing 0.0495 kg. Using genuine OEM coolant hoses ensures resistance to high temperatures and pressures, correct routing geometry, and material compatibility with engine coolants, preventing leaks and system failures.