Genuine OEM Audi Engine Coolant Hose, part number 9J1121632. This hose is a crucial part of the engine's cooling system, facilitating the flow of coolant to and from components like the expansion tank. It is a durable rubber hose, measuring approximately 8 cm long. Using a genuine OEM coolant hose ensures precise fitment, resistance to high temperatures and pressures, and a reliable, leak-free connection, all of which are essential for preventing engine overheating and maintaining system integrity.