How to remove drain cover mounting

[Waffle]

One of our showers has a tile floor. The drain was improperly installed. The fitting for the cover sits on top of the tile instead of level with the floor or recessed. This creates a barrier to water flow, so we have to mop the floor after each shower.

Here's a photo:
http://i32.tinypic.com/jzu3s.jpg

The plastic around the outer edge is very brittle, but the center part is solid. How can I remove this fitting? It doesn't unscrew -- or at least not any way I've tried. The black drain below is ABS. I reached in and noticed a bit of a gap between the white fitting and the black ABS.

I figured I'd replace the white fitting with a snap-in drain cover that's level or below the floor and seal with good-quality silicone caulk.

Thanks

[jadnashua]

As you've guessed, that is not the right drain for a tiled application. It also appears that the thing is not sealed to the drain pipe, either!

I don't know of any successful means to solve this problem without tearing some things up. It's unlikely that there's a liner under there as well (unless I'm all wet).

You may want to post this over at www.johnbridge.com (http://www.johnbridge.com) where they specialize in tiling and showers are a big part of it.

[Waffle]

Thanks. I posted a message at johnbridge. We moved in only a few months ago and there are many projects with higher priorities than rennovating this bathroom so I guess we'll stick with mopping for at least a few years. I was hoping I could find a simple fix. Oh well....