In non-spec-driven piping you can branch from another pipeline to the current one (e.g. with perpendicular option).
You can do the same with a third pipeline from the other side, so you will get a kind of four-way.
You can still add fittings to the branch points, but your 4-way will have to be added as a T-branch.
I am not aware of any issue with this kind of design, but I also can't say, whether there are none.
