Genuine OEM Volkswagen Fuel Tank Cap, part number 5C0201550AK. This cap is essential for sealing the fuel tank opening, preventing fuel evaporation, contamination, and maintaining proper fuel system pressure. It is located at the fuel filler neck. Weighing 0.0778 kg, this cap provides a secure and tight seal. Using a genuine OEM fuel tank cap ensures correct fitment, proper venting, and compliance with emissions standards, which is crucial for both environmental protection and vehicle performance.