I could be wrong, so dont hold me to this...
I think that this line you are talking about is
sold exclusively by certain high priced plumbing franchises
that are popping up thgoughout the country...
of course getting parts for reapirs you are at the mercy of that
same high priced company.... if parts are available at all....
if I am wrong,
and you see this in a hardware store somewhere
it is most certanly junk...that you should stay away from
so what is the sad story that goes along
with your first question??