I shut off the propane gas line at the valve and removed the corrugated metal connections just past the valve to an old hotwater heater (which I took apart, just for the fun of it - but that's a different story).
One question: What do I *cap* the gas line off with?
I ask because the gas line is "safe" with the valve turned off, but the valve can be nudged by someone, and while it stinks immediately if you open that valve, it seems that I should cap off the gas line with a semi-permanent cap of some sort that has to be screwed off so that it won't accidentally open.