The pipe you have is Hepsleeve ( check it out ) So I personally would leave it alone and plug in a Mac Alpine drain connector into the top of the bend . OR you're going to be doing a lot more digging But the hepsleeve pipe should resist being disturbed better than old salt glazed. The join you ask about is not the worst I've seen . It's your call really. PS what's outside the wall ? can you go through and then down outsideGood news! Finally started this project.
A
Also, looking into the clay pipe there is water sitting in there. Does the join between the bend and the pipe look OK?
Thanks
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local