Is it Ok to join the waste pipes from bath and separate shower together befoire they join the soil pipe, if so do I need a non return valve at all? What are the problems?
To get both into the soil pipe separately I will have to put in a 180 deg bend because of all the other fittings.
Richard
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.
David
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!
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