Genuine OEM Volkswagen Fuel Tank Cap, part number 3C8201550E. This cap is designed to securely seal the fuel tank opening, preventing fuel evaporation and protecting the fuel system from contaminants. Made from durable plastic, it includes an integrated tether to prevent loss. Using a genuine OEM fuel cap ensures a precise fit and proper sealing, which is critical for maintaining fuel system integrity and preventing 'Check Engine' light issues related to evaporative emissions.