The Ducting Adapter for the Viper S is a supplemental, cylindrical metal component that attaches to the nozzle area of the Viper S so that you can connect a ducting hose. It’s required when you must deliver fog to a location away from the machine, and is ideal for hiding the machine and ducting fog into props. This Ducting Adapter is designed for 2.5″ ducting hose (not included).