When and when not to use teflon tape?

["Turbo-T"]

Good info here.

 

[TurboBuRick]

Post below

 

[TurboBuRick]

On AN fittings, or any type of other flared fitting, the seal is in the flare on both mating ends of the tube/fitting, and NOT the threads.

Use teflon/sealer on NPT fittings only, where the seal is in the threads.

+2