We just replaced a Kohler toilet with another Kohler, and when we attached the water tank, discovered it's 3 to 4 inches away from the wall! It isn't flush against the wall like the old one and every other toilet I've seen. It's too late to return it, but now I don't know if it's safe to have a "floating toilet" and don't know if it's even possible to close the gap or hide it. Another obstacle....Arghhhh!