Genuine OEM Audi fuel line, part number 427201215D. This component is responsible for the safe and efficient transport of fuel within the fuel system assembly. It is marked as number 5 in the provided diagram. Engineered with specific material properties to withstand fuel exposure and pressure, this line ensures a secure connection throughout the fuel delivery path. Genuine OEM fuel lines are critical for maintaining system integrity, preventing leaks, and ensuring the correct flow characteristics required for engine performance.