I've done quite a bit of plumbing, but i'm no plumber...but i never use teflon. I use that pipe thread compound...Harveys..its cheap and seems to work good. We just did a bunch of plumbing at my mother's house and i used that on a few fittings and had no issues with leaks.
Threaded fittings can be a bear in plumbing systems..If your water is really hard, sometimes slow leaks (like really slow) can seal themselves up over time.
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