The Pail/Jug Mount Uni-Body W-20 Spray-All is a convenient container-mounted, low-volume spray applicator. This venturi injection system uses standard city water pressure (35 - 125 PSI) to draw chemical concentrate directly from the container and blend it into the water stream. Precision metering tips create an accurately diluted solution which is projected through the discharge hose and fan nozzle as a light, uniform spray. With a flow rate of just under 1 gallon per minute, this unit is great for spraying virtually any size area or object, slowly and completely, with very little run-off.