Sun-Mar Centrex 3000 NE Composting ToiletThe CENTREX 3000 NE (Non Electric) is the non electric version of the CENTREX 3000 composting toilet which is fitted with a 4 vent stack. This high capacity unit utilizes a continuous flow design for very heavy cottage or medium residential use. Using a continuous flow system, rotation of the drum moves compost along the larger and longer CENTREX 3000 drum, before it drops into the collection housing at the end of the unit. Under normal operating