Originally Posted by James_Blond
B/c of the way the backbottle asa/maybe all AGD asa's are threaded they will chew your tank oring up. Just replace the oring and make sure to go all the way in and out.
The threads are sharp, the pin depressor is long, and there is no vent hole after the o-ring seating surface. You fix all of that, they behave better.