Genuine OEM Audi Fuel Injector Return Line, part number 03L130235N. This critical component is responsible for returning excess fuel from the engine's fuel injectors back to the fuel tank, maintaining proper fuel pressure and preventing fuel system overload. It is a flexible line equipped with multiple connectors for precise routing and attachment to the injectors. Weighing only 0.05 kg and measuring 0.5 meters in length, this line is designed for specific routing. Using a genuine OEM return line ensures correct material composition for fuel resistance, precise connector fitment, and optimal flow characteristics, which are vital for engine efficiency and preventing leaks.