40 degree tips on surface cleaner?

[qons]

@marinegrunt does a good job of explaining it here

Unusual Streaks after using surface cleaner

Forget the surface cleaner for now. Let’s just concentrate on one nozzle. When selecting a nozzle the only reason for doing so is to select a different psi. You’re not selecting a nozzle for a change in gpm because that never changes. Your machine puts out whatever gpm it puts out. So, when selecting a nozzle for psi change, it always has to put out the same gpm as your machine. In your case that’s 3.5 gpm. You don’t have to worry about any other number on this chart. The numbers in the middle …