The bowl is the same.
The difference is in how the Flushmate tank is jetted.
Remove the restrictor on the 1.4 and it becomes a 1.6
I know the Flushmate system in both is the 1.6gpf. but is there a difference in the Kohler bowl? Is the same bowl used for the 1.6 as for the 1.4??
Last edited by Terry; 09-21-2011 at 10:30 AM.