Tornado Tube

thingiverse

Join two 2-liter bottles for a Tornado Tube experiment using this simple connector. Fill one bottle with water, attach it to the connector and screw on the second bottle. Invert and swirl to create a tornado! For a more watertight seal, use 7/8" garden hose o-rings. Print the connector part with 2-3 shells, remove support material from the center hole, and insert the o-rings onto both threaded sides. Enjoy this fun science project for kids!