You can tell I haven't had to do a job of that nature then :)
Thanks for the explanation - sounds a bit like one of those taps you
can install on a cold/hot water pipe for a washing machine feed, where
the tap cuts itself into the pipe.
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It screws into the top of a HW cylinder. You shorten and reconnect
the existing pipe which vents and delivers HW as before. You gain a
1/2" BSP tapping on the side which is connected to a dip tube into the
cylinder. To this you connect the hot side of your shower (or
pump). The cold comes from the roof tank.
The purpose is so that you get a hot feed for the shower which is
unaffected by water drawn from the rest of the system. If you just
tap into the vent pipe it will be affected if someone turns on a hot
Its brother is the Essex flange, which surprisingly is not more
This one requires you to make a hole in the dome of the cylinder and
fit the flange into it. This requires some guts of course. The
reward is that you do get a full bore feed whereas the Surrey flange
does cut both flows down a little bit,
A better solution to either is when you replace the HW cylinder to
order one with extra bosses fitted. This costs next to nothing.
I've got a couple of spares on mine in case of future requirements.
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