Sloan #3451671 152 ESS TMO SWB concealed sensor operated closet flushometer.  Dual filtered bypass diaphragm, rough brass finish, Optima valve, true mechanical override, LC closet 1.6 GPF/6.0 LPF.  NOS, comes in open factory carton, has never been installed.

***MISSING SENSOR ASSEMBLY AND SENSOR WALL MOUNTING BOX - YOU WILL RECEIVE THE PARTS THAT ARE PICTURED***

For more info & spec sheet go to:

https://www.sloan.com/spec-sheet/3451671