I decided to go ahead and finish my basement but i am unsure of what pipe goes to which appliance. I thought the 4" pipe was for the toilet but the more research i do i'm not so sure. There's also a 3" pipe next to the house foundation that i do not know what it is. I was also wondering if the 1.5" pipe is used for the sink? I would really appreciate it if someone could help me out. Thank you.[/ATTACH]