The Pharma W-50SS Sprayer is a water-driven, medium volume spray applicator for applying chemical solutions to a variety of surfaces. This stainless steel 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 down any sized area or object quickly and efficiently. The "Pharma" designation indicates that the Materials of Construction are compatible with the requirements of the Pharmaceutical Industry. This unit ships with a Certificate of Conformity.