HIGH DRAW FIXED CHEMICAL INJECTORS by GPDownstream pressure wash chemical injectors are installed after the pump. In order to function, the pressure must be lowered with the use of either a dual lance and soap nozzle, a fixed nozzle, a dual nozzle holder, or an adjustable nozzle holder. Water enters the inlet of the injector and creates a venturi effect which drops the pressure and suctions the chemical from container. Chemical can be injected either in concentrated form or in diluted form.