DeerValley Overflow Hole Round Ring (Fit with Pedestal Sink)DeerValley overflow hole round ring (Fit with Pedestal Sink) An overflow, a small opening in the sink, halp prevent the sink from overflowing. It works by letting air flow into the drain while the sink is full of water so the sink drains water more quickly. What's Included Overflow Hole Round Ring Not Included Pedestal Sink Specifications Item Number DV P01R21 Manufacturer DeerValley Type Overflow Hole Round Ring Warranty LIMITED WARRANTY COVERAGE 1