TOTO TET3LN#SS EcoPower Sensor High-Efficiency Toilet Flush Valve offers 1.28 gallons per Flush & is a concealed Toilet Flushometer Valve Retrofit Body. The Material used is Bronze casting with a stainless steel satin finish. The sensor-activated flush valve is a piston that increases life in tough water situations. The EcoPower Flush Valve is a Self-Generating system that does not require batteries or transformers for reduced maintenance calls. The Touch button is ADA Compliant & it has a 24-hour automatic flush for trap seal protection.