06/16/2018: I have the MTM nozzle pictured. They are a pretty standard stainless Chinese made nozzle. At times, I need to source other versions. They sell a lot and can be hard to get. Right now we have ones that fit a little snugger and are American made from General Pump.
The best way to get the most out of your pressure washer is to leave the unloader valve completely open and control the pressure output using a different sized nozzle. The Kranzle K1122TST is rated to at 2.1 Gallons Per Minute(GPM) Output. This 4.0 sized nozzle at 2.1 GPM gives us 1100PSI output, which is my preferred washer pressure.
This nozzle emits a 40 degree spray pattern. I've tried other patterns, but this one works the best for washing.