This is a hilarious demonstration that can be used for a variety of ideas. Basically you drop several Mentos brand candies into an open bottle of Diet Coke. The Coke shoots into the air, creating a geyser effect. This nozzle restricts the flow of the Coke and make it shoot much higher than just the open bottle. It consists of a Tornado Tube, Preform Tube and cotter pin that have been adapted for the lab.