This another great innovation by PSI except it has 2 orifices. This is a one hand adjustable nozzle. Tighten the nut down to a firm stop then back off in about 1/4 turn increments until you have the proper tension needed to adjust the nozzle in either direction.
Nozzle is a 30 degree spread pictured with the default brass nut for Slautterback applications and the black would be for ITW type applications. To order for ITW style use the -1- between parts number and orifice size.
Example: PS128-2030 = Slautterback style with .020 orifice size with a 30 degree included spread.
Example: PS128-1-2030 = ITW style with a .020 orifice size with a 30 degree included spread.