The TransJector is an "adjustable flow" chemical injector for feeding spray bars and arches with a nozzle flow rate from 3.3 to 7.3 GPM @ 40 PSI. This venturi injection unit uses city water pressure (40 - 125 PSI) to draw and blend chemical concentrate into the water stream. Both the water and chemical flow can be adjusted "on-the-fly" via needle valves making this a versatile unit for both new spray bar installations and retrofitting existing spray bar installations.