For difficult-to-spray powders, - like metallic, the OptiFlex®2 Stirrer unit is your best choice. It features an agitator for hard-to-fluidize or dry-blended materials and is easy to empty via a dump valve located under the stirrer container. Powder can be emptied directly into the original powder box. Like the OptiFlex®2 box and Fluidizer units, the OptiFlex®2 Stirrer is available with the double-gun option.