Whats the point of having a 1 1/2 bowl sink? What will an extra sink provide? This can only be answered once youve moved from a single bowl to a double bowl. The extra space allows a load of things - you can wash up, and drain vegetables in the other sink, you can use the second bowl as an outlet for waste by attaching a waste disposal unit to the drainer. Washing, rinsing, resting, draining, prepping - all can be done in the second sink. Sinks of this kind are a godsend for a busy kitchen!