The Auto Litter Box unit sits on a base/box w/wheels on the bottom.
The catch all plastic drawer (plastic bag lined) slides in under the black drop shoot for a sung fit.
The black shoot sits on a gasket to seal it to the box (no odor escapes). The top entry door has a gasket and after the rake dumps the litter down the shoot the door closes and seals keeping the odors from escaping.
We only have to dump this once a week and it’s odor free! Makes life a little easier!
Here’s a link to a short video to show how it works.