Powerbuilt 648941 Heavy Duty Piston Grip Grease Gun Uses standard 14 oz. cartridges, bulk fill or hand pack Convenient one-handed operation Knurled barrel for non-slip grip Heavy-duty construction and chrome-plated finish for a long service life Pistol-grip action for comfortable handling and easy use Working pressure is 5000 pounds per square inch Fitted with bulk loader and air release valve