When the bar gets busy, prevent sink overflow and flooding with the American Metalcraft OFP11 Overflow Tube Drain. Designed for 1 inch and 1-1/2 inch drains, this 11 inch tall overflow tube will start to drain when the water level reaches the top of the tube instead of continuing to fill the sink. It is ideal for 12 inch deep sinks but the plastic tube can also be cut to fit shorter depth sinks.