Harry K wrote:
....
Yes. If he needs it threaded at both ends the threads turn different
directions...or does it?...hmm, damn, now I have to go looking in my
junk pile for a pipe threaded both ends.

If that were true, you'd have one r-h and one l-h thread...somewhat
inconvenient at best...

The taper would be a possible problem though as it would be tougher to
get a leak-tight connection.