Norme 20 Pieces Tornado Bottle Connectors Cyclone Plastic Tornado Connectors for Scientific Experiment Test, 5 Colors

The children of all ages at vacation Bible School had a blast using these; even some adults got a kick out of making a ‘ tornado in a bottle’! Of course we had to get our own bottles. Just remember to use liter bottles, remove the cap and the plastic ring around the bottle cap to make the connector fit better.

I’ve ordered these a few times for my classroom. Even though I live in Japan I get these specific ones shipped over because they work well. I’ve gotten a little leakage from time to time but still was better than other ones I’ve tried. Usually it’s because of the bottle type and these have never cracked unlike some others!

I used these on standard 2 litter plastic bottles and didn't have any leaks or any other issues even though my 3 and 6 year olds (who were able to create tornados on their own) really put the whole setup through the ringer over many weeks, including heavily squeezing the full bottles, knocking them doesn on a hard floor, and leaving them outside for weeks. I bought a large package of and ended up giving most of them to a school for the kids to use and haven't heard any complaints.

They leak a bit but any I’ve ever bought do as well

Bought this for a classroom STEM activity. Perfect price for the set

That’s what my students said. They were so excited! Thanks!!! The lab was a total success.

Perfect for my classroom!

My nephew loves them. They hold up very well