Genuine OEM Audi Fuel Filler Cap, part number 8R0201550B. This cap is designed to securely seal the fuel tank filler neck, preventing fuel evaporation, spillage, and contamination from dirt or debris. It is an integral part of the fuel system, ensuring proper pressure regulation and emissions control. Weighing 0.0778 kg, this cap provides a precise fit and reliable seal. Using a genuine OEM fuel filler cap ensures correct sealing pressure, material compatibility with fuel, and proper tether attachment for safety and convenience.