Summary

A small but nice M25 valve protector I use it for my Nautec SLS Valve sit on the oxygen tank of my rebreather.

I added a ring at the top so you can distinguish the M25 from my G5/8 DIN Version.

When it's hard to turn I recommend to decrease the size around 1% depending on your printer.

If you want to mark your tanks (full/empty) just print out two different colors.