Rear toilet drain height - how much wiggle room

[Diyrental]

I’ve got a rear toilet I’m installing. There is only roughly 3 1/4” height to the center of the drain from the finished floor. This toilet (Yorkville Vormax) says 4” is needed.

I’m thinking (and desperately hoping) that I’m okay to install as is (with a neoprene gasket) and it would still be okay, since the rear drain on the toilet is 2” Anyone have thoughts or experience with this? I simulated where the gasket can be while still in contact with the flange and sealed in the second picture. You can see that the rear toilet drain is about 1/16” too high or so. Worse case, can I cut out some more room in the middle of the gasket? Big thanks!

 

[Twowaxhack]

Looks like the horn of the toilet will hit the flange.

Your bolts may not line up.

Try it and see.

 

[Diyrental]

I’ll be back over in a few days to give it a go. If the bolts work and the horn sits low enough, you think it’s okay to cut away a little bit of the inner diameter of the gasket, at the top, in order to have it sit lower on the flange?

Thanks for the help! Much appreciated.

 

[JG plumbing]

I would cut whatever material (looks like wood) you have around the pipe. You might get some wiggle and might let the pipe align better.

I happen to be setting 96 of these. They don't all align perfectly. I haven't had to much of an issue with the ones that don't.