I am adding a bathroom to my basement. My waste pipe is Cast Iron and located approximately 5' off the floor. I have decided to install a Sanibest Grinding toilet to handle waste pumping. I plan on installing a Lav Sink, shower, Saniflo rear eject toilet and Laundry Basin/Tub. The unit is vented with 1.5" PVC and the shower and wet vent for the sinks will also be 1.5". I plan on joining them to a 2" PVC which will be expanded to 3" in the attic to prevent frost closure. I plan on pulling the permit tomorrow but would like to make any big changes to my plan before I go in.
Can I run both sinks waste arms to one section of pipe that is then wet vented as shown in Iso Plan?
What style of T's are approved for joining multiple vent lines together?
Is my overall setup sound?