Genuine OEM Audi Engine Ventilation Line, part number 0P2121455G. This flexible hose is designed to route gases within the engine's ventilation system, playing a vital role in maintaining proper crankcase pressure and preventing oil contamination. It features specific routing geometry and connectors for a secure fit. Constructed from durable, heat-resistant materials, it ensures reliable performance under engine operating conditions. Choosing a genuine OEM line guarantees the correct material composition, internal diameter, and precise connection points for optimal engine function and longevity.