Push Button Bathroom Sink Drain without Overflow, ChromeMfr # K820 76. Keeney's decorative push button bathroom sink drain is an ideal solution for use with popular lavatory sinks, specifically pedestal, vessel, drop in, and undermount styles. It is ideal for sinks without an overflow. This drain fits a 1. 25 in. standard outlet and its brass body makes for a long lasting staple for years to come. With an easy push button closure to seal and release the drain, this pop up drain is easy to clean and