Here is my solution:
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You can drill out the small hole in the center of the plug to whatever size is appropriate for your ants. These use a 1/2in OD x 5/16in ID x 3/32in thick o-ring to provide sealing and hold the plug in a 16mm diameter test tube.
Here is where you can download the STL file and print them yourself: https://drive.google...iew?usp=sharing
Again...these are designed for 16mm glass test tubes! You may be able to scale them up or down for other sizes but you will have to experiment with exact dimensions.
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Edited by Subverted, August 4 2017 - 12:22 PM.