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Thanks for the answers, guys. I think I will be able to manage a bit better than 9mm/m...

Hi, I want to install a new toilet in a different position from the old one. I have to make a new hole in the wall about 1m from the old one, but at about the same height. This means that the wc waste pipe outside will now be about twice as long, and so its angle to the stack will be about twice...