I have a piece of 2" black PVC that connects to a hub (cast iron, I think) that comes out from the slab. That piece of PVC is short....about 4" and has developed a crack (from me being stupid). It looks like the PVC is sealed to the hub with lead. I need to replace the PVC (which has a vertical section of PVC above it) but am unsure how to remove the old...or how to seal a new piece in. Can anyone give me some direction on this? Any help would be greatly appreciated.