The Black Diamond DEF & AF Plastic Lever Pump delivers a 12 oz per stroke flow rate with quick priming and an ergonomic lever-action design for easy dispensing. A double blade piston increases suction power, and the 2" bung adaptor features a flared design for convenient tightening while allowing the pump to swivel freely for use at any position. The outlet includes an air vent cap that can be turned counter-clockwise to break siphoning action and stop flow. Supplied with a plastic telescopic suction tube and a 78" flexible corrugated discharge hose, it’s suitable for 15–55 gallon pails and compatible with water and water-based fluids such as DEF, windshield washer fluid, antifreeze, agricultural chemicals, lubricants, and more.