On Feb 9, 7:28*am, Karl Townsend
wrote:
Don't think the metal in pipe plugs is good enough.

I found grinding flutes in a steel plug was good enough for chasing
crud out of brass threads for replacing a showerhead arm. It meant I
didn't have to rip open the wall, but I don't know how well it would
have cut new threads in aluminum. I've found pipe taps at local
secondhand tool stores but the ones I had on hand bottomed out before
the threads engaged, so I improvised.

If all he needs is fittings (tees and pipe nipples) I guess I'm
confused on why he needs to make them rather than buy them in brass, I
can find 3/8 sizes even at the big box stores, they might just be
across the aisle from the large fittings in little bags/bins. Got to
be cheaper than a tap.

--Glenn Lyford