Genuine OEM Audi Engine Breather Line, part number 4M0121081CT. This essential component facilitates the escape of crankcase gases from the engine, preventing pressure buildup and ensuring proper engine ventilation. It is integrated into the engine's emission control system. Measuring approximately 0.27 meters in length, this line is designed for precise routing and connection. Using a genuine OEM breather line guarantees the correct material composition and resistance to oil and heat, preventing leaks and maintaining emission compliance.