fourth year
The square box is for the bathtub. The 3″ pipe is the vent, and the 3 1/2″ should be for the toilet. You need to connect the tank vent and the plumbing vent together and extend them up to the roof, unless they provided a pipe for you to connect it into. When you run the vent you will also install a fitting for the lavatory drain. Then you also need to install the water piping and tub/shower faucet.
