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You need balanced supplies as well
Only if the cold feed is also taken from the CWSC to the shower.
The unnecessary lower stopcock, if turned off, would remove the function of the pressure relief valve, so daft.
The D1 pipe might not...
Yea, the stopcock installed higher is fine, but the lower stopcock should not be installed at all, in my opinion.
As to the pipes to...
Thanks Darren, I'll take a look.
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