TOTO TET3LN31 High-Efficiency Toilet Electronic Flushometer Valve - 1 1/2 Back Spud Wall 1.28 GPF"

"AUTOMATIC FLUSHING SYSTEM TOTO, the world leader in advanced plumbing systems, provides sensor operated flush valves for facilities demanding the finest sanitation equipment for busy restrooms. “Hands-free” technology effectively reduces unsanitary conditions from unflushed fixtures. SELF-GENERATING POWER SYSTEM TOTO’s new technology of automatic generator flush valves offers easy installation without the cost and downtime required to install power supplies and wiring for each valve. A hydro-powered turbine charges the power supply during usage, eliminating the need for a battery replacement or consumption of external power for up to 10 years. SUPERIOR PISTON VALVE TOTO’s piston valve technology is a marked improvement over traditional rubber diaphragm type valves. Longer piston travel and a self-cleaning stainless steel screen to capture debris reduces common problems such as continuous running and flooding. The piston seat itself will not warp or misseal, reducing repair and maintenance costs. A micro-porous cup seal keeps the piston self-lubricated upon each activation with the incoming water supply. Hydropower self-generating system Electronic flushometer valve complete with 1" angle stop and 1-1/2" vacuum breaker set 1.28 gpf or less Back spud floor, top spud and back spud wall models - concealed 4" x 4" Cover plate 24 hour automatic flush for trap seal protection"