The Atlas Copco 6181786 is a genuine OEM AdBlue (urea) filter designed to maintain the purity of the Diesel Exhaust Fluid (DEF) system in various Atlas Copco QAS series mobile generators. This essential component prevents contaminants from entering the selective catalytic reduction (SCR) system, ensuring optimal performance and compliance with emission standards. Weighing 0.12 kg with dimensions of 95 mm length and 51 mm diameter, it is a direct replacement part for specified models.