I am renovating a small bathroom, including a shower. I am needing to replace the shower drain assembly, but it is a very tight area to do much work in, with no access from underneath. The current drain is 2” (it appears) ABS that was glued together. A P-trap is installed, and we’ve had no issues with the flow of water out of the existing shower (knock on wood). So I think the p-trap is in good shape.
Since it is too tight of quarters to replace the entire trap, I was hoping to cut the drain line off between the shower floor and p-trap, glue a collar onto the trap and connect my new drain to that collar (all joints glued w/ ABS cement, obviously). Does that meet code and is there anything I need to watch out for?