Genuine OEM Volkswagen Fuel Tank Cap, part number 5Q0201550AS. This essential component securely seals the fuel tank opening, preventing fuel spills, evaporation, and contamination from entering the fuel system. Weighing 0.069 kg, it is designed for a precise and airtight fit. Genuine OEM fuel tank caps ensure proper sealing and pressure regulation, which is critical for maintaining fuel system integrity, preventing evaporative emissions, and avoiding check engine light issues.