Required for converting electric composting toilets, the Sun-Mar AC-DC Kit enables you to operate electric toilets in non-electric or 12 volt mode. Enjoy the convenience of using your composting toilet without electricity or when 12 volt DC electricity is only available. This accessory is designed for use with the electric Sun-Mar Excel Self-Contained Composting Toilet and all Centrex Central Composting Toilet Systems. The included 12 volt 2.4 watt fan helps facilitate airflow when in non-electric mode to increase the evaporation of liquids, and the kit comes with an essential 4" vent stack and 1" diameter drain assembly. Sun-Mar is an innovative and legendary manufacturer in the composting toilet industry, and its simple, unique designs ensure proper evaporation and aeration for decomposing waste efficiently in an odor free way. Optimize the performance of your composting toilet with the Sun-Mar AC-DC Kit, which replaces all previous AC/DC unit options.