Diesel exhaust fluid (DEF) is essential for your diesel engine vehicle fleet in helping reduce engine emissions. Shop Grainger for our selection of diesel exhaust fluid pumps and diesel exhaust fluid systems to help you handle and store your DEF supply. Besides electric-operated transfer pumps, we have hand-operated drum pumps for DEF transfer. Versatile drum cart systems allow you to transfer liquid from large totes to smaller drum carts for added portability. From def pumps to def pump equipment, Grainger has the items to meet most of your liquid transfer requirements.