I just found this on an AMAZON site:
"I own a Harbor Freight 43430 spray gun that is only available with a 1.3mm nozzle. HF does not offer other nozzles for the 43430. I had heard that the HF gun was identical to the PC PSH1 gun. While I do not know if they are identical, the PC 2.2 nozzle fits the HF 43430 perfectly and allows me to spray thicker coatings that are difficult/impossible to spray with the 1.3mm nozzle that comes with the HF 43430. "
The P-C he is referencing is Porter Cable and probably more available and easier ( and EXPENSIVE
) than HF. But if you have a P-C gun......
I'm about to go to my local HF outlet and pick up a 43430 as they are sale priced at $39.99 today and I sure dont want to subject my new mega-buck gun to epoxy and 2K