Hello I just installed a TOTO Legato toilet which has that plastic unifit adapter with the rubber diaphragm. My question is when I set the toilet it seems to have only pushed down on the ring and I'm not sure if it's set correctly. I did hear and feel a small pop like it set but when I look with a mirror it looks like it's just pushed down. For those familiar with this toilet you can see the unfinished ring on the bowl to get an idea of how deep it went.