This composting system meets the standards of the National Sanitation Foundation Standard 41 testing. Additional Features * Includes Sun-Mar 510 Pint Flush Composting Toilet * Includes a 4 bolt toilet flange for mounting * Comes on your choice of seat height * Available in your choice of color * Requires a water hook-up * Fitted with a 4-inch stack * Supplied with a 1-inch drain hose * 4-inch PVC thinwall vent pipe * Uses standard toilet paper * Comes with a limited 3-5 year warranty The Sun-Mar Centrex 2000 Non-Electric Low Flush Composting System allows for a longer composting cycle and is rated for three adults or a family of five. This system comes with a Sun-Mar 510 Pint Flush Composting Toilet and a toilet flange for mounting. This system comes in your choice of color and seat height and is fitted with a 4-inch vent stack for ventilation. Installation of a 12-volt fan (not included) is possible with this system. A water hookup is required for use. This toilet is certified by the National Sanitation Foundation and has a three to five year warranty. Sun-Mar 510 Pint Flush Composting Toilet * Provides the benefits of a flush toilet * Minimizes the use of water * For use with the Centrex series * Foot pedal flush fills the bowl with water * Bowl is sealed by ball valve and Teflon seal * Can be flushed manually in the winter if necessary * Features a regular size toilet seat * Measures: 15.25W x 20.5D x 18.75H inches Sun-Mar 4 Bolt Toilet Flange * Used for mounting composting toilet * Comes pre-drilled with 4 floor bolts * Keeps you from having to modify a universal flange Sun-Mar In 1971 Hardy Sunberg developed the world"s first self-contained composting toilet that could be put in a bathroom and would evaporate liquids and compost solids. Over the years he developed a rotating drum with three chambers that would become the foundation for today"s toilets. To this day, Sun-Mar remains the world leader in researching and developing composting toilets. From self-contained units, to central units, and even composting toilets that are specially made for RVs and boats, Sun-Mar has over twenty models to choose from, and each is made to fill a specific need. Sun-Mar ensures that each of their toilets take advantage of a using a drum to create compost through aeration and mixing. All Sun-Mar toilets are also certified by the National Sanitation Foundation. * Allows for a longer composting cycle * Installation of a 12-volt fan is optional if needed * Rated continuously for 3 adults or families of 5 * Rated for vacation for 6 adults or families of 8 * Central unit composting toilet * System measures 49W x 26.5D x 26.5H inches