Genuine OEM Ford Adblue Tank Fill Lid, part number 1935539. This lid is designed to cover the filler opening of the AdBlue (DEF) tank, preventing dirt and debris from entering the system. A secure and properly sealing lid is crucial for the efficient operation of the selective catalytic reduction (SCR) system. The lid is made from durable plastic to withstand environmental exposure. Using a genuine OEM part ensures a precise fit and reliable seal for the AdBlue tank.