Hi Don;
Yes! I have a good source for that stuff. Well, actually two. First is my local Medical Supply house and Second; The Company that makes fittings and supplies for the Oxygen industry. ie. Oxy supplies for individuals.
The second company sends the stuff to my friend and he brings it over from the house.A third possible source is the folks that make parts for the R.C. Racing Boat market ( Gas).
I also made some of my own out of Aircraft grade Tubing ( Aluminum) and built some new Brush, Unit to Bottle fittings. All using Aircraft parts. They can be found. J