I did not want to put holes in my drybox so I made a quick plug that I can put on the one box which I am printing out of. Uses M10 couplers.
fits a box with a 60mm diameter cutout. printed in PETG, anything else should be fine.
Update: added M6 and mixed versions
Update: tuned thread pitch to M10x1
The author marked this model as their own original creation.