Would this work for CO2?

[Tameyourself]

http://houston.craigslist.org/tls/1102276999.html

High compression CO2 bottles, rated at 3000 to 4000 PSI. 36 ounce to 7-10 gallon sizes. Heavier than light walled bottles for dry chemical extinguishers.
I'm converting some to air compression bottles but will sell off at least half of what I have. You might have an interest in some of the lighter steel bottles which I have in abundance. $5 each

[grillmasterp]

Those should work-
However, its likely they will need to have a new Hydrostatic testing (good for 5 yrs) and you will need a standard CGA 320 valve.

[manifresh006]

+1

And would have more luck in the FS,FT,WTB section If your selling them??

[Tameyourself]

These are not mine, I saw the ad on Craigslist.

[miaboy2]

wait, i have a used fire extinquisher (B,C) where do I tanke them to be rebuilt into a co2 tank? is it cost effective?

[tnguyen]

The amount to retro and test is sometime as much as buying a new one.

[MerrittA]

Yea, I would not want to got through the hassle of having to convert those to CO2 canisters. Would probably save you money just to buy one. :-)