The toilet and lavatory sink pipes are already sealed against infestation as they pass through the concrete floor. Shower drains are sealed during installation, but tub drain are left exposed as they pass through the concrete. The Oatey Tub Boxes are designed to seal the tub drains that are exposed from under the concrete floor. The tub drain is installed inside the Tub Box before the concrete floor is finished, and the pipe penetration sealed. This completes an insect and rodent free installation.