Dispenses 16 ounce per stroke. Includes 2-5/8" pail adapter, 3/4" and 2 inch drum adapeter. For use on 5-15-30- and 55 gallon drums. Adjustable stroke from 4,8,12 or 16 ounce. Drum Pump,Piston,16oz Piston Drum Pump,Hand Operated,4,8,12 and 16 oz. Per stroke,Self Priming, 5,6,15,30 and 55 gallons drum capacity, 5/8"OD/1/2"ID suction tube,4000SSU Viscosity Operation Range,Piston Polyethylene, Repairable Lip Seal,Overall length 43 inches,Includes 2" Polypropylene Bung Adapter