Not on 10mm but on 8mm microbore I've just finished replacing 3 radiators
and fitted trv's on each using "Microbore" solder ring fitting reducers 15
x 8mm which I got from B&Q. They are manufactured by a company called IBP
Ltd , Tipton, tel 0121 557 2831. They may do 15x10mm ones. The tail didn't
look long enough as this group has already mentioned, but when the 8mm pipe
was soldered in place there was just enough 15mm tail for the trv olive to
grip. System now full and running, just all the blooming air to get rid
When I was fitting smallbore systems 30 years ago there used to be a very
handy endfeed reducer where the 15mm end was about 40mm long, making it a
doddle to fit a rad valve. A visit to your local trade counter would
probably be of help.
They are probably still out there...
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