Genuine OEM Audi Lower Coolant Reservoir Hose, part number 4H0121088AD. This essential hose connects the coolant reservoir to the rest of the cooling system, facilitating the circulation of coolant and maintaining proper fluid levels. Its specific molded shape ensures correct routing and a secure connection. Weighing approximately 0.284 kg with a length of 0.5 meters, this hose is engineered for precise fitment. Choosing a genuine OEM hose guarantees the correct material composition for resistance to heat and coolant chemicals, along with the exact geometry required for reliable, leak-free operation.