Genuine OEM Audi Fuel Tank Cap with Strap, part number 420201550D. This essential component seals the fuel tank opening, preventing fuel evaporation, spillage, and contamination from dirt or debris. It is designed to provide a secure and airtight closure for the fuel system. Weighing approximately 0.075 kg and measuring around 7.5 cm in length, 7 cm in width, and 6.5 cm in height. Choosing a genuine OEM fuel cap ensures the correct thread, sealing mechanism, and material composition for a perfect fit and long-term reliability, maintaining the vehicle's emissions system integrity.