California Faucets | Zero Drain Pop Down Lavatory Drain in Polished Chrome Pop-down style Single unit for both overflow and less overflow applications 2-1/4" diameter polished and finished upper flange and stopper only 1-1/4" OD X 4" tailpiece (total below sink length is 6-1/2"; length is 7" when thin sink spacer is used) Maximum installation thickness 2" (add 9050Z-EXT for thicker applications) If used on widespread faucet with lift knob & rod, it is recommended to add LR-RET