The Uni-Body W-50 Spray-All is a water-driven, medium volume spray applicator for applying chemical solutions to a variety of surfaces. This venturi injection system uses standard city water pressure (35 - 125 PSI) to draw and blend chemical concentrate into the water stream. Precision metering tips are used to create an accurately diluted solution which is projected through the discharge hose and fan nozzle as a uniform spray. With a flow rate of around 2 gallons per minute, this unit is great for spraying virtually any sized area or object quickly and efficiently.