All,
I am removing a leaky and poorly installed drain on a fiberglass shower. Under the drain cover I found this hard yellow thing. It seems fairly solid -- I was able to ship it with a screw driver, and it appears to have a little bit of play in it.
What is it; and how do I get it off?
http://farm4.static.flickr.com/3488/...8a9b31f6ca.jpg