The Insecticidal Duster makes it easy to apply insecticide dust into wall voids and other hard-to-reach areas. This model features an "O" ring at the adjustment screw to eliminate or reduce leakage and its internal spring reduces user fatigue. For extra protection, place the tip over the adjustment screw to insulate against leakage. Simply pop off the top, fill the powder duster half full with appropriate dust and reapply the lid. This duster has a red powder coat at the bottom of the duster and on the handle for easy identification.