wrote:

Great ascii art...I had seen this described on uk.diy some months ago
but was worried about flow rate through the 22mm to the pipe as its
internal cross section is reduced by the presence of the 15mm pipe to
the shower.

Well to an extent it will have to reduce the flow a bit, but by how much
is going ot be hard to call. The situation is unlikely to be any better
with a "real" Surrey flange unless you can find one that fits directly
into the cylinder 1" connector without requiring any reduction boss.

--
Cheers,

John.

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