fourth year
My concern is that you should not have to ask these questions unless you are not too experienced in plumbing. Your first concern would be to determine what sinks, etc, are connected to the 2″ pipe already and then whether your plumbing code will allow your new sinks to connect to it also. Many codes limit 2″ drains to 6 fixture units, (not fixtures), and some fixtures are rated at 2 or 3 fixture units.
