Badger recently changed the shape of their Propel Cans to the design shown. The old style regulator that we modified to use no longer works on the new can...Daniel Rich first made them in the late 80's. I actually had been using even an older design that Mark Lowrie made for me 30years ago that doesn't work either.
Pictured is the #50-200 Regulator that was designed for people to Air Brush w/o using a Car Tire,Scuba Tank, or Compressor. I made this one the same way we made the old ones but didn't cut the part that punctures the seal in the can. It works great. If you need one -even though I know most folks just use "Dust Off' or something similar- I'll be able to make you one for under $10.
The tip doesn't fall off if you use a plastic extension & bump something, it's available at many Raceways thus being more convenient & helping the Raceway survive, some 'dust off' type products don't shoot out cold when doing an emergency 'cool down' to a motor, & it generally lasts longer as it's bigger than many of the other type cans.