Built-in agitator for mixing contents with every pump of the pressurizing handle, which keeps dissolved products suspended in solution at all times. High efficiency, fully internal piston pump mechanism prevents leaks and keeps the solution off the operator. Independently tested for 1,500 hours of use with no breakdowns. A ruggedly built unit at a great price. Oversized 4" fill cap for easy filling. Positionable pump handle for right- or left-hand use. Carrying handle on top. Includes an ergonomically curved tank and thick padded shoulder straps to provide maximum comfort, even with extended use. Comfortable spray handle with 4' x 1/2" hose, 2' wand, and two different nozzles for multiple applications. Holds 4 gal.