I want to move a toilet in my master bath. I plan on reconfiguring an existing 4" drain which has a 2" shower drain and a utility sink drain currently attached to it. The toilet will be about 3-4 feet to the stack. I'll need to remove the 2" PVC drain from the 4" cast iron drain and replace it with a 3" PVC pipe which will I reduce to 2" near the top to connect to the vent. I'll make a new connection for the 2" shower drain and a new connection for the 3" toilet drain. Do I need to vent the toilet? I have an extra vent pipe from the old shower location. Should the shower drain be above or below the toilet connection or doesn't it matter? Is it ok to have the laundry sink drain below the toilet drain? I've attached a picture of the current setup.
Thanks
Thanks