20 if u can fit it, its $11 to fill/swap well worth it, then if u have more tanks just add to that regulator and save even more rather than tons of 5lbers. 109 is fair but really its a tank an you will have to swap it out at some point, its cheaper to fill that way an u dont have to worry about the stamp on it also, but some people have to have the NEW item even when it doesnt do anything but sit there.
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