1960 house. Main plumbing vent in the attic. From a distance it looks like cast iron, However it is joined with a coupling and on close examination the black is some sort of coating.Looking closely at the coupling, it looks like the pipe material itself is white.
I’m wondering if this is Transite. I’ve seen Transite pipe many times, but never with any coating like this. If it is, it appears to be pretty well encapsulated.
Can anyone confirm whether this is Transite (ACM) or some other material?