Genuine OEM Audi Coolant Hose with Coupling, part number 1K0122051HM. This flexible hose is a critical part of the engine cooling system, responsible for transporting coolant between various engine components to maintain optimal operating temperatures. Weighing 0.35 kg, it features an integrated coupling for secure connections. Choosing a genuine OEM coolant hose ensures it is made from high-quality, heat-resistant materials with the correct internal diameter and routing geometry, preventing leaks and ensuring efficient heat exchange for reliable engine performance.