To install a gravity-drop exhaust pipe with the composter beneath:

1. After carefully measuring, cut a hole in the floor or floors and place the connecting pipe through the hole and into place in the top fitting of the compost container, if it is provided. Remember that the composter can be moved to adjust the location.
2. Use a plumb bob from the center of the hole to locate the inlet to the composter.
3. Using a waterproof sealant such as silicone caulk, seal any gap between the connecting pipe, floor and the top of the tank.
4. Unlike solvent-welded joints, silicone perfects a seal, but allows the connection to be broken if you want to change the location of the composter or pipe in the future.
5. Place the toilet stool atop the connecting pipe.
6. The connecting pipe can be cut to desired height to accommodate your toilet above the floor surface.
7. Position the toilet stool around the pipe – according to the specifications of the toilet stool you have selected.

Note: Some composters might have problems with the impact of the flush water and excrement and feces falling 30 ft (9 m) from the second floor toilet to the composter in the basement. It causes major craters and splashing of the processing material. One could add splash plates to prevent this. Ask the manufacturer for recommendations.