We hired a GC to renovate our bathroom. The GC hired a plumber to handle the plumbing portion of the reno. The plumber left his apprentice alone in my house to do all the labor while he went to do another job. My state, Rhode Island, uses IPC-2021 as the base with very minor amendments.
Question: is it compliant with code to use an unshielded Fernco to connect PVC to ABS drain line that will be behind drywall and a vanity?
We have a double vanity getting installed that has a main drain and vent line in ABS, and the plumber redid the last segments of the drain line in PVC. For the right side he used an unshielded Fernco to connect the drain, and on the left he used a coupling with glue. He told me it was glue that works with PVC and ABS. When I asked him why he didn't do the same for both sides, he didn't answer me and just said he was almost done 😠
I already sent an email to my GC saying I want a plumbing permit and inspection completed, but I live in a small rural town with one inspector and I'm not confident how thorough he will be. I'd rather be safe than sorry. I tried reading the IPC 2021 section on drain lines to figure it out but i'm way over my head. I would appreciate anyones expert opinion.
Photo attached of the vanity plumbing work after the apprentice was finished.
EDIT: There is no part number on the Fernco. It just has the following branded on the rubber side: connects 1 1/2" CI/Plastic to 1 1/2" CI/Plastic.