Genuine OEM Audi Adblue Tank Cap Cover, part number 4L0131980E. This cover is designed to protect the Adblue tank filler cap from dirt, debris, and potential tampering, ensuring the purity of the Adblue fluid. It is located over the Adblue tank's filler neck. Made from durable, chemical-resistant plastic, it weighs approximately 0.2 kg. Using a genuine OEM cover ensures a secure fit and proper sealing, which is critical for maintaining the efficiency and longevity of the vehicle's emissions reduction system.