OPW is pleased to offer to our customers our DEF/AdBlue handling hardware series products. The OPW 21Gu DEF/AdBlue hanging hardware family is the world's global leader in retail Diesel Exhaust Fluid dispensing equipment. The OPW 19DEF Series Industrial Automatic nozzle is in a league of its own. When you are responsible for ensuring the safe, reliable and affordable dispensing of Diesel Exhaust Fluid (DEF/AdBlue) trust the best brand in dispensing nozzles – OPW.