cutting (US) pipe taper thread
Yes, of course the usual pipe taps are tapered.
You will want to use Al parts, because Cu is
a major corrosion issue -- maybe galvanized
is OK, though.
If you bore and straight-thread on the lathe, the
final machining is just a quick touchup with the
tap. Just look for NPT taps, stands for
National Pipe Thread.
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