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Pipe dope. I use the Megaloc. Done properly and keeping the tape off the first 2 threads is fine for using thread tape. Too many guys pile it on and then little pieces of tape get cut off and go into gas valves etc.

On water, with the crappy fitting threads quality now days, I put on one layer of tape then dope.
 
Dope any kind and drive it home. Peoples lives are at stake here never put gas pipe together thinking to make it easy to take apart. Allways back up flex fittings and do the same. Like a german virgin gootandtite!
 
The Teflon issue about deteriorating has been repealed, but we must do what local code dictates. If it is a big gas job, dope if it's a gas valve replacement tape because it's already on my tool pouch.
 
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