Sorry I am posting so much  - but I just figured out your first pic. It looks like the piece you screw the plastic piece to is also missing. I would expect there to be a metal threaded piece coming out of that hole in your first pic - and the plastic would screw to that.
https://www.google.com/search?q=oxyg...tm%3B222%3B111
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DOG is my co-pilot
Cricket w/two 5 lpm oxycons - and sometimes a Minor.
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