We are going to remove a bathtub and replace it with a Swanstone retrofit shower, which is the same size as the tub. They come with the drain on the right or left, to fit the plumbing of the tub you are taking out. My question is, do you have to do any additional plumbing? I know the tub has an overflow drain. Does that have to be removed or capped or anything to install the shower?

Any help will be appreciated.