And, I suppose the external thread of the existing pipe has a
left hand thread?

NOT!

This (below) is one really off the mark writing.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
..

"Bob" wrote in message
. net...
:
: Union couplings should be used only in situations where the
pipe would
: need to be opened for service. Otherwise use a solid pipe
coupling with
: left hand thread on one side.