Do not use teflon tape or other thread compounds on metal to metal flare seals (between the flarenut and the adapters). Its fine on the NPT side of the adapter.
Be sure to leak test everything.
Why two threads for the same topic?
So don't use the yellow tape or pipe dope on the flare fittings?
Nope, flares are a compression type fitting. They require no dope or tape.
Why two threads for the same topic?
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