[Shop-talk] Cast iron to PVC soil pipe adapter?

[Jim Franklin]

I'm adding a half bath in the basement and I'm toying with doing the  
plumbing myself. My soil pipe is cast iron, laid horizontally just  
under the surface of the slab. Then there are 2 45s to bring it  
vertical. I need to yank out the 45s and insert a 90. I've seen  
adapters online for inserting vertically PVC pipe into cast iron  
flanges, but never horizontal where the water will theoretically sit  
on the joint. Do I use the same fitting or is it a different process?  
Is there a brand name fitting? Which sealant or caulk?

thanks,
jim