There is a moment in every pressure washer owner’s journey when the nozzle stops being just a nozzle and becomes a puzzle. You look at the tips in the pack, each with a different color and a tiny stamped number, and wonder what any of it means. The color tells you the spray angle, but that little number is the part most people ignore, and it happens to be one of the most important specs on the entire machine. The tip size, measured in orifice diameter, governs how much water actually flows through the nozzle, and that in turn affects your pressure, your cleaning power, and the health of your pump. Understanding the pressure washer tip size chart turns guesswork into precise, safe, effective cleaning.
This guide walks through nozzle tip sizing in full. We will cover the color codes and what they mean, the orifice numbers and how they relate to pressure and flow, why tip size must match your machine’s GPM and PSI, a complete tip size chart, how to calculate the right tip, what happens when the tip is wrong, and practical selection tips. By the end, you will read any tip with confidence and know exactly which one to use.
The Two Things a Tip Tells You
Every pressure washer nozzle encodes two pieces of information.
- Spray angle (color): How wide the water fans out, from a pinpoint to a wide rinse.
- Orifice size (number): How much water flows through, expressed as the tip size or orifice diameter.
The color controls the shape and concentration of the spray. The number controls the flow. Both must be right for your machine.
Color Codes and Spray Angles
| Color | Angle | Typical Use |
|---|---|---|
| Red | 0 degrees | Pinpoint, stubborn spots; highest damage risk |
| Yellow | 15 degrees | Aggressive stripping and tough stains |
| Green | 25 degrees | General cleaning, most common |
| White | 40 degrees | Rinsing and gentle cleaning |
| Black | 65 degrees | Soap and chemical application |
Lower angles concentrate pressure and clean aggressively but risk damage. Higher angles spread the water and are safer for delicate surfaces.
The Orifice Number: Why It Matters
The tip’s number is its size, most commonly expressed as a two-digit figure where the last digit represents hundredths of an inch and the first digit represents tenths.
- A larger number means a larger opening and more flow.
- A smaller number means a smaller opening and less flow.
- Flow through the tip affects pressure and workload on the pump.
This is the part that connects the nozzle to the machine. The wrong orifice size either starves or overpowers the system.
Why the Tip Must Match Your Machine
Pressure and flow after the tip depend on the pump’s GPM and PSI and the tip’s orifice size. Match them, and your machine runs at its rated output.
| If the Tip Is… | What Happens |
|---|---|
| Too large | More flow than the pump can supply; pressure drops |
| Too small | Restricts flow; pressure rises above rating; pump strains |
| Correct | Machine runs at rated PSI and GPM |
An undersized tip is the more dangerous error. It raises pressure above the machine’s rating and forces the pump to work harder, which shortens pump life and stresses every component in the pressurized path.
How to Find the Right Tip Size
The correct tip size is determined by your machine’s GPM and PSI. Most manufacturers publish a tip selection chart in the manual, and nozzle makers provide the same. The relationship works like this:
- Find your machine’s rated GPM and PSI.
- Locate those values on the tip chart (often printed on the nozzle package).
- Read the corresponding tip size.
- Choose the spray angle for the task, using the same size.
| Machine Example (psi / gpm) | Approx. Tip Size |
|---|---|
| Low flow electric, 1300 psi / 1.2 gpm | Small orifice |
| Mid electric, 2000 psi / 1.5 gpm | Small to mid orifice |
| Gas residential, 3100 psi / 2.5 gpm | Mid orifice |
| Gas commercial, 4000 psi / 4.0 gpm | Larger orifice |
What Happens When the Tip Is Wrong
- Pressure drops when the tip is too large, and cleaning suffers.
- Pressure spikes when the tip is too small, stressing the pump and seals.
- Pump life shortens with a chronic mismatch.
- Cleaning is uneven or ineffective.
- Components wear faster across the whole pressurized path.
Reading a Tip Package
- Find the color on the tip or label, which gives the spray angle.
- Read the number, which gives the orifice size.
- Check the chart printed on the package for your GPM and PSI.
- Match both color and size to your task and machine.
Practical Selection Tips
- Use 25 degree green as your general-purpose default.
- Use 40 degree white for rinsing and gentle work.
- Use 15 degree yellow only for tough jobs on hard surfaces.
- Avoid the 0 degree red except for rare, precise work.
- Use black 65 degree for soap and chemicals, often with a downstream injector.
- Keep spares of your most-used sizes.
- Replace worn tips, since erosion changes the spray and the flow.
Frequently Asked Questions
What do the numbers on pressure washer tips mean?
They indicate the orifice size, or tip size, which governs how much water flows through the nozzle. A larger number means a larger opening and more flow.
How do I choose the right tip size?
Match the tip size to your machine’s GPM and PSI using the chart in your manual or on the nozzle package. Then choose the spray angle for the task.
What happens if I use the wrong tip size?
A tip that is too large drops your pressure and reduces cleaning power. One that is too small raises pressure above the machine’s rating and strains the pump.
What do the nozzle colors mean?
Colors indicate spray angle: red 0 degrees, yellow 15, green 25, white 40, and black 65 degrees for soap. Lower angles are more aggressive.
Do I really need the exact tip size?
Yes. The right size keeps your machine running at its rated PSI and GPM. A mismatch reduces performance and can damage the pump over time.
Final Thoughts
The pressure washer tip size chart is one of the most useful tools a pressure washer owner can master. It connects the color that controls spray shape to the number that controls flow, and both to the rated output of your machine.
Match the size to your GPM and PSI, choose the angle for the job, favor green and white for general work, and be sparing with the aggressive angles. Keep spares and replace worn tips. Read your tips correctly, and you will clean more effectively, protect your pump, and get the most out of every nozzle in the pack.