Tornadoes in A Bottle, 20 Pcs Plastic Tornado Bottle Connector Vortex Connector Cyclone Tube for Scientific Experiment, 5 Colors

These were perfect for my preschool. It fit on your standard bottle opening. We were even able to make it work with two smaller bottles and that was easier for the little ones to handle! Also hasn’t leaked once!

I bought these for the grandkids. Came packed nicely and fast. Thank you

I bought it for a STEM Camp, and it was great. But one came broken. It serves its purpose, but sometimes leaks

They worked to create a tornado and the kids loved it. I did notice they do not work with short capped water bottles, like Poland springs and similar styles. The tubes worked with smart water bottles and soda bottles.I wanted to share that because we don’t drink soda and got lucky with having hosted a holiday function and had the leftover bottles.

Talk about a blast to the past! These little guys are great. We did a science theme drive by birthday party. These were a hit with the kids and the parents!

The kids love them! My youngest is really into tornadoes, so this was the closest we could find. It’s fun to color the water and put glitter in it to make it more exciting. Beware though, they do leak some

They are great. They work just as I hoped. My daughter's students will enjoy making Tornados in a bottle.

I tried these on regular (cheap) water bottles for the tornado experiment and they did not fit. However, they did fit soda bottles, including the smaller soda bottles. It took us a few tries to make the water spin--we had to twirl it "just right". Once we got the hang of it, it was pretty entertaining.

Works well, my kids have a lot fun making water tornadoes

Who doesn’t like to build and watch a tornado in a bottle