I am remodeling a bathroom shower and want to move the drain a couple of feet I broke up the concrete and the pvc drain goes into a cast iron main drain. What's the best way to remove the pvc so I can re-route the drain using pvc once again into the cast iron.

Cut the PVC before it connects to the cast iron, then replumb the drain with PVC. If possible do not disturb the connection to the cast. Assuming that the PVC is connected to the cast with a rubber grommet they are not the easiest thing to make, especially in a trench.

Just what exactly is the fitting connecting the PVC to the cast iron? Back to you, Tom

I wish I could but there is no room between the two only about a blade length I would like to try to cut between the two heat up the joint with a blow dryer and try to get the rest out then just reroute the drain any suggestions? Thanks for the tips