Originally Posted by Punkkone
I improvised when I had to do this a few years back, used a tire inflater with a pressure gauge, taped it up with vulc to seal against the bottle.. Tapped the trigger gently a few times and held it in place a few minutes to make sure pressure didn't drop. Could easily have zip-tied it to the bottle to do ocular inspecition for leaks..
careful with this only need 12 psi and no mess so you can leave pressurized for the amount of time it takes for leak to occur