Mine goes a bit further than that and replaces the screen tops. I got tired of always having to remove the whole lid when I needed to get into the tank.

This is a 45G that is split for my pair of Centralian carpet pythons. I also did a 75G that currently houses an Irian Jaya carpet. There are a few more pictures of it in my gallery. The longest wait was for the glue to dissipate the smell (about 4 days). I waited until I couldn't smell it anymore to put the snakes into their tanks.