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    Basin waste - 1 1/4 or 1/ 12?

    I'm trying to replace the waste in my downstairs WC. The existing waste is 11/2 inches as is the pipework below. I'm struggling to find a 1 1/2 inch basin trap though. I'm guessing I can't substitute a 1 1/4 inch version as the gaps will be too large between the basin and the traps? Any ideas...
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