I wish I would have known that this seat is not for ALL toilet seats. I don't mean round or long toilets, I mean how the cover is screwed into the toilet itself. No where in the literature online does it indicate that you need to have a system that screws into a bolt that you then tighten underneath (or for some, inside) the toilet. Our 4 year old toilet (Kohler) is the kind of toilet that uses a toilet seat that doesn't have a backing to the screw. If this doesn't make sense, basically all you need to do it check to see if your toilet seat comes off with a screw underneath the toilet, and if it does, you are good to go. Unfortunately, this didn't work for us. Paranthetically, it incredibly heavy from the plastic seat I am used to, might be difficult for little fingers to navigate.