Brass Push Button Bathroom Sink Drain. Bathroom Basin Stop and Pop Lavatory Stopper Without Overflow. Fit for most sinks with drain hole from 1-1/2 in. to 2 in. Dia and with non-overflow hole.Brass Push Button Bathroom Sink Drain. Bathroom Basin Stop and Pop Lavatory Stopper Without Overflow. Fit for most sinks with drain hole from 1-1/2 in. to 2 in. Dia and with non-overflow hole.