JOINT-TUBE

This JOINT-TUBE makes it possible to hermetically join two plastic bottles of the same size. Fill one of the bottles with water (at ¾ capacity). Then join the two bottles with the Joint-Tube. Turn them over to put the bottle filled with water on top of the other. By quickly rotating the top bottle (with the water), you can create a spectacular tornado as the water descends into the other bottle. Bottles are not provided.