If you have a HotHead torch -- DO NOT RUN THE FUEL LINE THROUGH THE WALL.
It is illegal to run more than 20 PSI of fuel gas through any wall structure.
That said, if you are using a dual gas torch (oxygen/propane), you will need to have two valves, one for each side of the wall (it seems like overkill, but it is code). On the inside connection after the valve, simply use a brass barbed connector for 1/4" rubber hose, and match the threaded side to whatever size pipe you are using.
On the outside, do exactly the same.
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