I am trying to replace the faucet in the kitchen.
The existing pipes are cast iron pipes - very old - I would like to partially replace them with abs pipes. I will need to cut the cast iron and join the cast iron and the abs pipes.
How would I do that.

I will need to cut the cast iron and join the cast iron and the abs pipes.
how would I do that.
You do that with a shielded coupling, (see image) in the correct size. Good luck, Tom