Liked the unit and appreciated the safety cover control. That prevents operation if the cover is not installed completely preventing any operation while the drain is open or uncovered.

The geometry change cause by the additional 3 inches of the collar needs to be considered to make sure both the cabinet depth and the cross over alignment of the drain pipe will work. That is because the side drain of the unit also drops between 2.5 and 2.75 inches. The installation therefore will take some additional plumbing work and small parts to allow replacement of a non collar/control cover unit.