The 2-Way W-20 Spray-All is a water-driven, low volume spray applicator for applying up to 2 chemicals to a variety of surfaces. This venturi injection system uses standard city water pressure (35 - 125 PSI) to draw and blend chemical concentrates into the water stream. Precision metering tips are used to create accurately diluted solutions which are projected through the discharge hose and fan nozzle as a light, uniform spray. Use the chemical ball valves to inject the 2 chemicals separately or simultaneously. With a flow rate of just under 1 gallon per minute, this unit is great for spraying virtually any sized area or object slowly and completely with very little run-off.