"Aidan" wrote in message
m...
(BAHADIR) wrote in message
. com...

or may be a link to a site about system...

See also information about the diverter-tee/monoflo-tee system at the
site below. This system isn't used in the UK, so far as I know.

http://www.heatinghelp.com/heating_howcome3.cfm

The diverter tee is similar to a spreader "Y" tee. We don't use diverter
tees because a simple, cheap in-line restrictor can balance up a system.
"Y" tees are horrendously expensive.