Delta 1600T6203TR-BB Hard-Wired Electronic Concealed Flush Valve Trim with Battery Back-Up (Chrome). The Delta 1600T6203TR-BB is part of the Parts Series. This trim set is a hardwired electronic concealed flush valve for freestanding toilets with 1-1/2" back inlets. It comes with a 14" by 14" front access cover, and comes with a battery back-up, complete with a watertight connector and 9V battery. This kit also features stainless steel vandal-resistant mounting screws for the wall plate. This valve kit requires a rough-in to be bought separately, and has selectable sensing distances (24" to 56"). This product is ADA and ASSE 1037 compliant.