Identify this gas cylinder (type of gas, purpose)? And gas questions

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I've got this old gas cylinder I found somewhere, and I'm wondering if it would be good for anything (hopefully argon/CO2, or perhaps CO2?)Is cylinder testing prohibitively expensive?If this would be useful, can you tell what size it is by the markings?  You can see that it's fairly short, perhaps 20 or 40 cf?  I've also got a much larger cylinder, that has a metal collar around the top, with the name of a gas company on it (no longer operating, at least around here) and I wonder how using that cylinder would work, or if it would even be possible.  How does gas filling work?  My dad does oxy-acetylene and he just "exchanges" his cylinders, with a "99 year" lease that he's had as long as I can remember (he's 82.)  Does it still work like that? Or how does it work.  I know a lot more folks own their own cylinders now, so what's the process for getting them filled?Thanks,Scott in Brighton NY
Reply:That looks like an CO2 cylinder to me.  You could take your cylinders to a welding supply outfit and ask them about testing and refill/replacement.  Best regards Bob
Reply:The little red one looks like co2 to me too. You can google "cga 320" and view images to compare to yours. You can use co2 as MIG shielding gas for thicker steel. For the larger bottle, YMMV because treatment of owner bottles varies from place to place. Company name on the neck ring of a large bottle can mean "not ours so we won't fill it". If the company no longer exists they may have been bought out, so you may have an "in" there. Best possible scenario would be to produce the 99 yr lease paperwork... altho that may have language saying the lease does not pass on to descendants. Your best bet may be to call around and ask how to get that bottle filled, or if you can sell or exchange it.
Reply:Could be a halon cylinder.
Reply:Thanks for the responses.I decided to look up the 3AA1800 stamped in the top of the cylinder, and everything I found says 20# CO2 cylinder.  How long does 20lbs of CO2 last when welding?  How many equivalent "cubic feet" would that be?  One of my purposes with the welder will be building and repairing tractor implements, so CO2 should work for some of that work, and I gather it's cheaper than Argon/CO2 mix.Scott in Brighton NY
Reply:Originally Posted by 80sDweebThanks for the responses.I decided to look up the 3AA1800 stamped in the top of the cylinder, and everything I found says 20# CO2 cylinder.  How long does 20lbs of CO2 last when welding?  How many equivalent "cubic feet" would that be?  One of my purposes with the welder will be building and repairing tractor implements, so CO2 should work for some of that work, and I gather it's cheaper than Argon/CO2 mix.Scott in Brighton NY