Stay prepared with an accessory 2.5 and / or 4-gallon SwapTank™ for your Vortex™ Mist Blower. The SwapTank™ removable tank system can be filled and stored away from the blowing unit and then clipped into place once your are ready to spray. Easily switch between empty and full tanks. *It is recommended to use a tank with a cleaning solution to purge chemicals in the pump, hose, and wand between chemical swaps.