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Ralph Mowery

In article ,
says...

On Sun, 15 May 2016 10:32:04 -0700 (PDT), bob haller
wrote:

a plmber i know uses both, teflon tape and then pipe dope

he has been a plumber forever and said it guarantees no leaks

Teflon tape is not supposed to be used on natural gas lines. Something
about the gas dissolving the tape. It's ok on propane though. There is a
special tape made for nat. gas, but I have never used it. so I dont know
the name of it, or if it's readily available. Years ago, I did some work
on nat. gas pipes, for my parents. I just used pipe dope. Where I live
now, I only have propane, but I still use pipe dope. Normally people use
copper tubing for propane, so no sealer is needed since the fittings are
flared copper or compression rings. But my house had black iron pipe for
the furnace. When I ran a line to the kitchen for a stove, I decided it
was best to keep the same pipe to prevent dialectric corrosion, so I
used black iron pipe with dope in the fittings.

It is still teflon tape that is used on the gas lines. It is most often
yellow to signify that it is double density (thicker) than the white
tape.