The Drum Bung Mount Uni-Body™ W-50 Spray-All has threads to fit most bung openings, and is a water-driven, medium volume sprayer that mixes chemical with water and projects the solution in a uniform fan pattern. This venturi injection system uses standard city water pressure (35 - 125 PSI) to draw chemical concentrate directly from the drum into the water stream. Precision metering tips control chemical volume to create an accurately diluted solution that is projected through the discharge hose and fan nozzle. With a flow rate of around 2 gallons per minute, this unit is great for spraying virtually any size area or object quickly and efficiently.