I've had good luck with the pink teflon tape. It's a good bit thicker than the white.
Teflon Tape Problem
Sep 09, 2011
22 Replies
Vic Smith laid this down on his screen :
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First, sorry for taking so long to get back to you. Just got my NG's working again. This is garbage simply because this type of guideline demands precision tapping and reasonable cutting standards. If one cuts too many threads it can bottom out on any female connector that narrows down soon after the threads. Also, the female threads would need to be machined to a uniform standard, but they are not. Therefore one cannot set such a standard as the number of threads showing on a fitting.
3-4 threads showing is hardly a standard. But it works. I've threaded many pipes with machines and hand-turned dies. Never "cut too many threads." Threading machines have a stop, and with hand dies you thread until the pipe is flush with the die. Look at some threaded pipe at the store. You should see the same number of threads on every one. Can't speak to female fittings. Had some bad ones. Very few.
--Vic
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