Genuine OEM Audi Expansion Tank Coolant Hose, part number 7L6122109E. This critical component is responsible for transporting coolant between the expansion tank and the main engine cooling system. It ensures efficient circulation of coolant to maintain optimal engine operating temperatures. Weighing 0.34 kg, this hose is constructed from durable materials designed to withstand high temperatures and pressures. Choosing genuine OEM ensures the correct routing geometry, material resistance to coolant, and secure connections for leak-free operation.