When you get a new machine, you probably notice it comes with 3–4 different colored nozzles. What do they mean—and can you use the nozzles from your old machine?
The answer is not a simple yes or no.
The nozzles included with your pressure washer are specifically sized for your machine to deliver the correct pressure (PSI) and flow rate (GPM).
When we say “sized,” we’re referring to the orifice size (the small hole inside the nozzle). Even if two nozzles are the same color, they can have different orifice sizes.
Just because you have an old yellow nozzle and a new yellow nozzle does not mean they are interchangeable.
Each nozzle has a set of numbers stamped on it:
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The first two numbers indicate the spray angle.
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The last two numbers indicate the orifice size.
That’s how you determine whether a nozzle is correct for your machine.
What happens if you use the wrong size?
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Using a larger orifice than recommended:
Your pressure (PSI) will drop, but your water volume (GPM) will stay the same. -
Using a smaller orifice than recommended:
You will not gain more pressure. Instead, excess water will bypass back to the buffer tank, reducing your effective flow (GPM), while pressure remains the same. This can also put unnecessary strain on your system.
The drawing below visually represents the different nozzle colors and the spray width of each nozzle when held at the same distance from the surface.
There are five standard color-coded spray patterns
Red – 0° Cutting Nozzle
- Very concentrated, pencil-point spray.
- Usually not included as a standard nozzle.
- Even at lower GPM (3 GPM) and low pressure 2000–2500 PSI, it can easily damage surfaces.
- Can cut through dirt, wood, and softer materials.
- Can also damage concrete, stone, and asphalt if misused.
Yellow – 15° Chiseling Nozzle
- Works like a scraper on hard surfaces.
- Great for removing paint, grease, and heavy buildup.
Green – 25° Flushing Nozzle
- Most people’s go-to nozzle.
- Balanced cleaning power and coverage.
- Good for cleaning siding, sidewalks, metal furniture, and sweeping debris like leaves and grass of of side walks
White – 40° Wash Nozzle
- Widest spray pattern.
- Spreads pressure over a larger area.
- Generally safe for aluminum siding, windows, and vehicles.
Black – Soap Nozzle
- Designed to pull soap through your injector.
- To stop soap, simply switch back to a high-pressure nozzle at the wand — no need to return to the machine.
Specialty Nozzles
There are two additional nozzles available that can help increase efficiency and make cleaning easier: a turbo nozzle and a downstream long-range adjustable nozzle.
Turbo Nozzle
- Combines the cutting power of the red 0° nozzle.
- Spins in a circular motion.
- Cleans like a 25° nozzle but with much more impact.
- Great for heavy-duty concrete cleaning.
Adjustable Downstream Long-Range Nozzle
- Works with your chemical injector.
- Can apply chemicals at distances up to 60 feet (depending on machine size).
- Adjustable spray pattern.
Don’t Adjust the Unloader to Reduce Pressure
A common mistake when trying to reduce pressure is:
- Turning down the unloader
- Idling the engine back
Both are hard on the machine and not recommended.
If you want to safely reduce pressure, the correct solution is simple:
Increase the orifice size of the nozzle.
As a rule of thumb, increasing the orifice by about a half size will reduce pressure by roughly 500 PSI.
For example:
- Switching from a #8 to a #8.5 nozzle will lower pressure safely and properly.
That’s the right way to dial in your machine — without damaging components or shortening the life of your equipment.