Genuine OEM Audi Engine Ventilation Hose, part number 059103221AD. This hose is a vital component of the engine's ventilation system, facilitating the efficient removal and circulation of engine gases. Its specific routing and material composition ensure proper crankcase pressure regulation and emission control. The hose features a durable construction, partially wrapped in fabric for protection. Using a genuine OEM hose guarantees the correct routing geometry, material resistance to oil and heat, and precise connections for optimal engine performance and longevity.