I'm plumbing a new washing machine and am tapping into the existing sink waste via a new open trap with U-bend. The existing waste which I am using is about 400mm up, so there is only room for a short vertical length of waste pipe below the worktop. Does that matter?
the problem will be how fast the water can get away, it is common for the vertical pipe to fill slightly as the m/c empties, rinse time is the worst because there is more water.
i would be inclined to take the waste directly to the outside drain to be sure
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