Smitty Two wrote:

Grave danger? Nuts.

0. check for and eliminate sources of ignition, such as a
candle-powered miner's helmet on your head, or a cigarette in your
mouth.

1. gather together one slicer valve, preconfigured in the closed
position, one roll of teflon tape, one finger, and an appropriate
wrench.

2. remove flexible pipe from supply pipe.

3. insert finger (note that subsequent steps will be slightly easier
if the finger used is not your own.)

4. clean threads

5. wrap threads with tape

6. remove finger

7. install valve

Instead of a finger, slip a FINGER COT over the outlet. A finger cot looks
like a teeny condom (and, for all I know, used as such by some non-Texans).
Since there's only about 2 ounces of pressue in a gas line, the tension of
the cot should be sufficient. You can get them at the pharmacy, along with
knowing looks from the sales clerk.

And a lit cigarette won't ignite natural gas.