I started on adding a bathroom in my basement and dug up the groung to the soil cast iron soil pipe. I cut the soil pipe and went back with pvc 40 under the concrete. Is this the correct way before I seal up the floor?

i started on adding a bathroom in my basement and dug up the groung to the soil cast iron soil pipe. i cut the soil pipe and went back with pvc 40 under the concrete. is this the correct way before i seal up the floor?
It depends on what fitting you came off the cast iron main to convert to PVC.
A wye or combination wye and eighth bend's acceptable. A sanitary tee is not. What fitting did you use? Regards, Tom

I put a pvc y piece between the cast iron and added my new 4" dain for the toilet, cleanout, and shower.

I'm looking for a vent in your post. Did you vent the shower? Will there be a lavatory in your group? Back to myou. Tom