Pop Up Sink Drain with Overflow. Smooth convenient push-button operation, water-tight seal. Easy assembly, easy cleaning. Brand new, magnificent necessities for your bathroom vessel sink. Fit for most sinks with drain hole from 1-1/2" to 2" in diameter and with non-overflow hole. Brass Gold Push Button Bathroom Sink Drain Stop & Pop up Lavatory Stopper with Overflow Bathroom Basin - Akicon