Genuine OEM Audi protective ring, part number 0AQ409375A. This protective ring functions as a seal or guard for a component within the drivetrain, likely a differential or gearbox, preventing ingress of contaminants and retaining lubricant. It is made of metal. Genuine OEM parts are critical for drivetrain seals and protective rings to ensure proper sealing, prevent leaks, and maintain the longevity of sensitive components.