Is it feasible to add a tee to the kitchen sewer main?

Cut off the original tee at this time and add a three-way is easy to achieve, you should belong to the first floor, or you want to hit the floor if you don't have to go downstairs?

It can be operated, but it is not easy to implement.

As you can see from your photos, the main sewer pipe is a shared sewer pipe in the building.

There is a waterstop ring made during building construction where the sewer pipe passes through the floor slab.

If you want to walk under the floor, you will inevitably destroy the original waterstop.

Usually, there is a great possibility of waterproof leakage when decorating, even if it does not leak now, it is not easy to say that it will not leak in one or two years.

Generally, the aging of waterproof materials, the deformation of building structures and many other reasons may cause secondary waterproof leakage.

If you're on the ground floor and there's no basement downstairs, there's nothing wrong with that.

If you still have someone downstairs, it is recommended that it is best not to do it close to the ground, and it is best to be more than 150mm from the ground (leaving a three-way installation position).

Otherwise, if it leaks, it will be difficult to repair, and some will be annoying!