Genuine OEM Audi Water Radiator Hose, part number 4G0121049L. This critical component of the engine cooling system is responsible for transporting coolant between the engine and the radiator. Positioned on the right side of the radiator assembly, it is constructed from high-quality, heat-resistant rubber with a protective fabric sleeve to ensure durability and resistance to extreme temperatures and pressures. Using a genuine OEM radiator hose guarantees the precise shape, correct routing, and material integrity, which are essential for preventing leaks and maintaining the overall efficiency of the engine cooling system.