"Danny" wrote in message
...

To this is screwed on a copper pipe adapter that has a
female threaded opening (pipe threads) and hex flats on it. That, then
attatches to the hot two copper pipe lines above with the usual methods of
copper pipe and sweat on couplers.

What you refer to as a copper pipe adapter is a dielectric union. This
provides an electrical insulation between the copper and the galvanized pipe
to prevent electrolysis.

--

Roger Shoaf

About the time I had mastered getting the toothpaste back in the tube, then
they come up with this striped stuff.