Watertight Plugs

I made this for a friend who needed to seal some kind of lines while working on his car. I use these for cleaning glassware with alcohol and rock salt ;D They seal up nice when printed with TPU.

Maybe someone who knows their way around openSCAD can make a customizable one but I'm not too good with that yet. Anyways, I've included a few sizes, you should be able to shrink or enlarge some in your slicer without messing up the seal. It will need a little support to print, place it handle up and support from bed only should be fine. Included sizes are:

25mm
21mm
18.5mm
5/16" (~8mm)