Lobster wrote:

Yes, that's fine. Assuming you have adequate fall on both waste pipes,
there's no need for non-return valves or anythig like that.

Second that...

Also try and get a "swept" Tee for the extra connection to the pipe in
the middle - along with a slight fall on the pipe run that ought to
ensure there is no danger of your bath water popping up in the shower!

--
Cheers,

John.

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