Does Ductile Iron Rust?
Ductile Iron dose rust but at a much slower rate than Cast Iron I only use it when the owner wants the old style piping (Okam and lead) for the seal. I believe it will out last you and any kids if it has a protective coating it will last over 75 years if memory serves but I haven't installed any in years I usually change to ABS and a no hub (also called a fernco coupling). I think the No hub and abs is much easier to install. so those art the 2 methods I use.