I don't know, the last time I looked, all of my toilets have some sort of connecting pipes between the tank and the bowl. This unit, however pretty, has this weird supportive/stabilizing bar near the bottom that can not possibly go behind the plumbing, so it has to be removed leaving the unit kind of wobbly. I don't know, it's pretty though.

Pros: It's pretty
Cons: It's wobbly