The thought process behind not using Teflon tape on natural gas or propane was that if a piece of tape was cut off by pipe threads it would end up in a gas orifice downstream and block a burner or alter a pressure regulator. Now to qualify that statement, it’s from trade school 100 years ago and north of the 49th. It may be the right thing to do elsewhere. Ymmv. Len Mitchell Crazy Legs 1989 37+ Midland On
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