Many people put it in the shallower, smaller sink. It's your call, as the main sink might get a lot of gunk thown into it, too. Because the trap arm in the wall for the drain needs to be lined up properly it is usually easier to have the disposal in the shallower sink so the trap arm isn't that much lower, but as long as gravity works and your trap arm allows constant down-angle slope, it could be either position. You may have to lower the whole connection in the wall if you choose the lower sink.





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