circa 1929, Boston
The kitchen sink connects to cast iron inside the wall. Just below the connection the section of vertical cast iron pipe is rotten and leaking. A couple of feet above it ties into the vent and right below it connects into a hub, part of a ginormous cast iron fitting that has the 4" stack, the outlet to the WC, a, vent for the WC, a Y out to the tub/lav: 6 connections in one fitting. It looks good, doesn't seem to have any of the rot.
Why is it rotten? Does it bode ill for the rest of the system?
I plan on cutting it out from above the kitchen TY to the hub below. It's kind of tight for any type of cutter. Is there a particularly good sawzall blade for this? Any tricks on getting the pipe out of the hub below? What is the best way unpack the fitting. What do I repack it with; can you still even get lead?