Genuine OEM Volkswagen Fuel Cap with Retaining Strap, part number 5C0201550E. This cap securely seals the fuel filler neck, preventing fuel evaporation, protecting against contaminants, and maintaining proper fuel system pressure. Constructed from durable, fuel-resistant plastic, it includes an integrated retaining strap to prevent loss and weighs approximately 0.105 kg. Choosing a genuine OEM fuel cap ensures a precise seal, proper venting, and compliance with emission standards, which is critical for fuel efficiency and preventing check engine light issues.