We (our plumber) had to special order the bit that goes in the drain through the sink and attaches underneath. $$. You might also want to know that the bottoms of the sinks are not flat, so you wouldn't, for example, set a wine glass down in the sink upright or it could tip easily and smash. Sink looks beautiful and we managed the issues without too much delay or expense, but there's often a reason why things are on sale, and this sink was an example of that.