I am trying to remove the original fiberglass tub from the second bathroom. I've gotten everything out, except the drain in the floor. I have no idea how to remove this. The stopper will turn both clock & counterclockwise, but does not come apart. Help!

You may have to go under the home to see if a large nut is holding it

The stopper may have a cap , if so unscrew it, then there is a allen slot or a flat head groove to unscrew before it can be removed, if this don't work, just go under the house with a hacksaw and cut the pvc drain line. Its very simple to replum this later