Yuck. started having some drain issues awhile back, last few months got worse, few week ago started to back up in tub when washer emptied. dug up the line and ran pc plastic piping in the feel fro clog/break. hit a spot under house wall/crawl and thought was break in line catching debris.
was an issue there alright, can’t believe drain line worked, period. The big “coupling” was where I thought would be snag in line. cast iron going into plastic. Looks like someone ran heavy duty chemicals in there at one time and melted bottom of plastic.