No nozzle tip but a little bit of a change in the diameter and surface as it goes through the side wall of insulation. It is just a piece of black pipe. I run mine at tank pressure no regulator, some of the other guys are using regulators I do not know what they are doing pressure wise.
It is just a piece of black pipe, air slots, mig tip letting propane in on one end, and welded to the other.
I always thought if I made another I would not weld the pipe on, but after seeing how well Dan's forge works I am not sure. I am beginning to think is 6 of one or a half dozen of the other.
Charlie