Can a Nathan K3HA be added onto

My question is as I’m new to the train home community I picked up in Nathan K3HA in beautiful condition recently and I noticed they have ports on the end of the manifold that look like they are for adding on to the horn. Does this mean you can add 2 extra horns and it becomes a K5HA or does it not work that way?


Pics would help, but yes, it sounds like it might be a K5 manifold with block on block offs.