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i woulk like to kow why they didn't just hook the drain from the barsink into the washer (that was sitting right there) drain line?
Most likely for code reasons. When a washer discharges, it pumps more than the drain can handle, hence the reason for the tall stand pipe the washer is connected to. If the bar sink were tied into this line, the sink would fill with washer discharge. Who wants that?