This composting toilet meets the standards of the National Sanitation Foundation Standard 41 testing. Additional Features * Available in your choice of colors * Connect 1-inch rear drain to an approved drain pit * Depth required to remove drawer: 46 inches * Vent outlet center distance from right side: 11.25 inches * Requires drilling into your wall or ceiling for venting * Includes a 3-5 year limited warranty * The standard toilet for living off the grid * Uses standard toilet paper Designed for those who want to truly live off the grid, the Sun-Mar Excel Non-Electric Waterless Composting Toilet is a self contained unit that is rated for continual use for two adults or families of three. Available in your choice of colors, this toilet has a 4-inch mounted vent which provides odorless operation. Certified by the National Sanitation Foundation, this unit requires drilling into your wall or ceiling for venting. 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. * 4-inch mounted vent provides odorless operation * Designed for those without a continuous 110 volt supply * Rated continuously for 2 adults or families of 3 * Rated for vacation for 5 adults or families of 7 * Self contained composting toilet * Measures 22.5W x 33D x 32H inches