This is my shower drain pipe under my second floor bathroom.
It appears to be 1 1/2 inch copper. It also has a sleeve around it. I tried to scrape the sleeve. I don't think it is rubber. It appears to be some kind of metal. I googled it but couldn't find anything similar. Does anybody know what type of pipe this is? I am planning to connect it to PVC using a coupling. Do you think something like this would be okay?
https://www.lowes.com/pd/Fernco-2-in-x-2-in-x-2-1-2-in-dia-Coupling-PVC-Fitting/1000075331
Or since the pipe is 1.5 inch, would it be bad to use a 2 inch PVC drain? (going from smaller to larger pipe?) Thank you very much.
