That’s usually a floor drain. You can prevent a sewage ... Or you can seal the drain with a 2-in. test plug, also sold at home centers. A plug will stop rising sewage, but you’ll have to ...

If you want to install a shower over a concrete floor, a fiberglass shower ... did the work to confirm it. The 2-in. pipe is typically the shower or tub drain. Line it up exactly with the drain ...