The Sun-Mar® Excel-NE has long been the standard toilet for those living off the grid. The Excel-NE is a high capacity non-electric composting toilet. Like all Sun-Mar® composting toilets the Excel-NE incorporates a patented Bio-drum™ which ensures fast and odourless decomposition. The Excel-NE is the preferred self-contained model for residential or heavy cottage use. Saves thousands of gallons of water, while recycling waste into safe useable soil. The unit is shipped fully assembled. To install, simply connect the supplied 4'' (10.16 cm) vent stack and security drain. Its seasonal capacity is 5 adults or families of 7 while its residential use is 2 adults or families of 3.