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The EL-128-A actuator assembly is a replacement for Optima® ES (electronic solenoid) or Optima® ES-S (electronic solenoid sensor) solenoid flushometers. Optima® ES and ES-S actuators are for the Royal®, Crown®, Regal®, and Sloan® style flushometers. The EL-128-A actuator assembly is intended for solenoid flushometers operating with a 24V or 120V electrical supply. The actuator is plastic and is located on the opposite side of the incoming water supply. Sloan offers additional actuators and solenoid repair parts based on your flushometer needs.