Summary

This is a customizable gasket - you coud print it out with a caulkstruder or something similar.

For similar designs useful to scientists see the Open-Source Lab How to Build Your Own Hardware and Reduce Research Costs

Instructions

Choose your thickness, inner and outer diameters - make your STL and then print on your favorite open-source 3-D printer.

End goal to extend the range of applications of 3-D printable open-source appropriate technologies

Lots of experiments to come with different caulks, silicones, etc. If you have had success with any materials you think would be appropriate please leave a note in the comments. Thanks!