Canister gas exchange

[kremlin]

Those pressure tanks do pretty much what you're requesting, they contain a shit-ton of gas and refill canisters when attached to the adjacent port (wrench the canister in place when over the port, then turn the valve)
The only thing is that they are anchored, and they do not leak (afaik) so you can't do anything nefarious with them. Which is why I suggested 02/air high pressure tanks being either included or concentrated in an "atmos" area rather than being scattered about the place which confuses the player as to their purpose (I know for a fact they were barely used on cogmap 1) while plasma tanks/c02/n02 are in limited supply and do not get high pressure tanks for balancing reasons.

aha! okay, so maybe what i'm looking for is one of those for plasma.