Hi,
I am putting a a double bowl kitchen sink, further from the waste outlet (in the wall) than the previous sink. The fall after the U bend is either horizontal or may even be uphill by the time it is fitted. Is it permissable to take the U bend back up, after it has done its U business so that it will raise up the level of the waste pipe ie. the U bend will be a complete U not a J which is the usual configuration. thanks


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