"The Sun-Mar Excel non-electric self-contained composting toilet odorlessly converts human waste into safe fertilizing soil. This model is designed for medium to high capacity use, ideal for a 2-3 people in a residential setting or 5-7 people at a cabin for a weekend. Vent Stack Size in. 4, Electric No, Dimensions L x W x H in. 33 x 22 1/2 x 32, Drain qty. 1, Detachable Footrest Yes, Pest Proof Yes, Product Type Composting toilet, Self Contained Yes, Venting Kit Included Yes, NSF/ANSI Certified Yes. Non-electric model ideal for applications off the grid Uses no water 100 non-polluting Includes variable diameter bio-drum with recessed handle for processing compost Includes 1in. drain"