I'm no expert, but I've replaced all of the galvanized drains that went into the cast iron with the threaded PVC adaptors and was just glad to get rid of the corroding pipes. Everything has worked out well for years now. Well, except for that time I was replacing the last one and in taking out the galvanized pipe, it broke the whole outlet right out of the cast iron stack. But after repairing that big mistake (seems you avoided that one), I've never had a problem with the PVC into the cast iron.





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