thanks for reply - I was worried because I had 3 exterior pipes pushed through wall on 2nd floor ( quite high) of mansion block to make new bath room - 1 - for WC; 2 - for bath; 3 - for basin & shower.
A "bathroom fitter" has put down WBP (water boiled ply) onto floor without putting pipe to connect where shower will be to exit pipe 3 - hence enquiry!
I presume if exit pipe 3 is used there will be no back flow - but if WC pipe is used - what about "backflow"? thanks!
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