Din scuba valve cap

Here is valve cap to keep derbies from getting into DIN valves on scuba tanks.
My printer tends to over size things a little so I reduced the scale by about 3% to make the threads run smoothly.
the small hole in the top is large enough to run some nylon line through as a keeper.

I have added a second version of this where the line is able to come out the side of the cap to allow for better sealing from the elements than the first version