TOTO High-Efficiency Hydropower Toilet EcoPower Retrofit Flushometer Valve Body, Satin FinishToto TET3LN#SS EcoPower 1. 28 Gallon Per Flush Concealed Toilet Flushometer Valve Retrofit Body. The EcoPower Flush Valve is a Self Generating sytem that does not require batteries or transformers. The Sensor activated flush valve is piston operated for increased lifespan in tough high traffic conditions. The Toto TET3LN#SS does not require scheduled mainenace calls and reduces continued cost to operate. Stainless Steel Finish. No batteries or power