Genuine OEM Audi Adblue Filler Cover, part number 4L0131980D. This cover is designed to protect the Adblue fluid filler neck from dirt, debris, and environmental exposure, which is vital for maintaining the purity of the Adblue solution. It is located over the Adblue tank's filler. Made from durable, chemical-resistant plastic, it weighs approximately 0.0275 kg. Using a genuine OEM cover ensures a secure and proper seal, which is essential for the reliable operation of the vehicle's selective catalytic reduction (SCR) system.