ABS to PVC transitions - Rubber coupling

[Sai T.]

I’m confused about ABS to PVC transitions - Rubber coupling Vs Glue.

Drywall wall is not put back yet and I can remove the rubber coupling and use the Glue to connect ABS to PVC. 

Plumber is used the rubber coupling. Is it good and acceptable to use rubber coupling?

[Bob H.]

The coupling looks OK, assuming that it's designed for the outside diameters of the pipes, but the notch in the joist is bad. It weakens the joist significantly. I don't know the best procedure to compensate for the notch, but you need something.