Dust cap for the regular Fidlock bottles as seen in the pictures. The problem was that I have my Fidlock holder underneath the bycicle frame and the bottle including the mouth piece always gets muddy. Instead of buying a new bottle with the build in dust cover, i decided to design a dust cap for the bottle i have.
This is the first version and it snaps on the moth piece very nicely. Removing the cap is a little bit more tricky (try to turn the cap while removing it). Anyway, after it's been tested for a while i might created a second version with some sort of ring or handle on the top to simplify the removing of the cap.
The author marked this model as their own original creation.