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The EL-126 nut hex is a replacement kit for concealed Royal®, Sloan® or Regal® Optima® ES-S WB (electronic solenoid sensor with wall box access) style flushometers. The EL-126 nut hex is part of the mounting hardware kit, and is intended for concealed electronic ES-S WB flushometers. The EL-126 #8-32 nut hex holds the EL-196 electrical box within the stainless steel wall frame and operates with a 24V electrical supply. Sloan offers additional sensors and repair parts based on your flushometer needs.