Genuine OEM Mercedes-Benz Fuel Filler Cap, part number A0004701000. This cap seals the fuel tank filler neck, preventing the ingress of dirt and moisture while also minimizing fuel vapor escape. It is a critical component for maintaining fuel system integrity and preventing evaporative emissions. The precise fit and material ensure a secure seal, preventing leaks and contamination. Genuine OEM parts are manufactured to exact specifications for optimal performance and longevity.