Bottle Connector for Swirl / Vortex / Tornado in a Bottle

This bottle connector allows you to join two plastic bottles together, creating an exciting vortex effect. 

Fill one bottle with water, attach the connector, and invert the bottles so the water-filled bottle is on top. Shake it, and watch as the water flows down, creating a large, mesmerizing vortex in the lower bottle. 

Perfect for educational demonstrations, fun experiments, and as a great toy for children with autism spectrum disorder. 

The gasket can be easily modified with different opening diameters for varying flow rates, and it should fit a large variety of different bottles. 

=== Use TPU or any other flexible material for gasket === Maybe it works with PETG as well, didn't tested that…