Umbrella lavatory drain does not close. This design replace grid-style lavatory drains, but does not suffer from slow or stopped drainage. This drain has overflow drain holes in its drain cup; however, its unique design allows it to be used on sinks without overflow. The drain is fully finished below the sink, and the screw mounting system makes it ideal for extremely thin or very thick sinks. Fully finished for exposed installation. Fits sinks up to 2-3/4 in. thick with an opening of 1-1/2 - 1-5/8 in. opening. Uses a 1-1/4 in. tailpiece. Heavy brass construction