THe 10oz co2 tank will fall under the 2x2 rule, so it should never have to be hydrotested. (the reason being that tanks that narrow are next to impossible to hydrotest).
However, you will find that most fields will have trouble filling it. I'd guess that most will claim they can not.
Technically you need a DIFFERENT adapter than the one used on pin-valves. If you use that style, it will leak like crazy. However, all you need to do is have them drop an oring into the fill-station ASA, and you can usually fill it no problem.
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Last edited by Brewtt; 07-04-2012 at 02:54 PM.