Not Ranked
The tapered pipe sections of a male fitting that thread into a casting are the part that would use the teflon tape. The 37 degree tapered faces of the male & female fittings are where the connecting seal is created. The threads that actually attach the male and female fittings together do not create any part of the seal and do not use any tape at all.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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