Waste pipes in bathroom

20 May 2012
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United Kingdom
Hi there, some quick questions for you..

I'm replacing the bath, sink and shower in my bathroom with like for like items. The only difference is that the sink/toilet is a fitted unit so there's not much space for the waste pipes

So........ I currently have the waste for the sink joining the soil stack, directly below that the toilet joins the stack then the shower waste.

The Sink waste is too high so I was wondering if I can just push the sink waste into the toilet waste which will run below it, and block up the other pipe as the fitted furniture blocks the original sink waste?
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