If you wish to put the macerator unit behind a wall, it is made easy by using a proprietary extension pipe.
The extension pipe is 16 inches in length and one side is pushed onto the spigot of the toilet and the other side slips inside the macerator connection. When using the extension pipe, the toilet bowl should be raised 3/8 inch for additional gravity flow toward the macerator box.

15-3/4" long x 4" wide with a 5" bell housing