Genuine OEM Audi Fuel Tank Cap, part number 8J0201550N. This cap is designed to securely seal the fuel tank opening, preventing fuel evaporation, spillage, and contamination from dirt or debris. It is located at the fuel filler neck. The cap is made from durable black plastic and includes an integrated tether to prevent loss, weighing approximately 0.078 kg. Using a genuine OEM fuel cap ensures a perfect seal, proper pressure regulation, and compatibility with the vehicle's fuel system and emissions controls.