Foxden

It would depend on your source of compressed air. Most compressors are adjustable and have their own regulator.

I have the Harbor Freight gun. It works fine. It adjusts the spray fan direction (horizontal to vertical) the spread of the fan and the amount of glaze that comes out. I have been quite happy with it. I have other sprayers purchased from ceramic supply companies but find this one to be better. You can buy a stand for it as well as spare containers.