Auslauf für den Wassersack der Schweizer Armee

My first attempt to create a cap for the "Schweizer Wassersack". Take care. The item is far from being perfect. It may destroy the thread of your "Wassersack" or even could destroy your life.

Maybe someone with cad skills could create a better version?

I customized "https://www.thingiverse.com/thing:1648726" in openscad and added a tube freecad. Its one of my first tries to create something. The thread isn't perfect, but works for my purposes.

You will need a seal around the inner tube.