Genuine OEM Citroen Urea Tank Plug, part number 9816581680. This plug is designed to securely seal the opening of the urea (AdBlue) tank, preventing contamination from foreign particles and ensuring no fluid leakage. It weighs 0.054 kg. Using a genuine OEM plug ensures a perfect fit and proper sealing, which is critical for the reliable operation of the Selective Catalytic Reduction (SCR) emissions system.