In our unfinished basement, we have a roughed-in bath. I can see a water closet exit, a sink exit, and a tub exit.
The tub exit is covered by this product: http://www.oatey.com/products/rough-in-products/tub-box/tub-box. It's installed upside-down (the manufacturer's mark is reversed, hence my deduction). I have no affiliation with this company; this is the product the builder chose.
I tried peeling this off a bit without damaging it, and can see gravel beneath the concrete foundation. I'm not sure if there's a pipe or something else leading to the sewer from this point on.
Here's my question: What should I do with this, to be able to install a tub + surround combination in the basement?