Pressure washer nozzles are color-coded by spray angle: red is 0°, yellow 15°, green 25°, white 40° and black is the 65° low-pressure soap tip. The narrower the angle, the more force lands on a smaller spot. Color is only half the story, though. Every tip also has an orifice size that has to match your machine's pressure and flow, or you lose cleaning power or overwork the pump.
This chart covers both: which color to use for which commercial job, and how to calculate the right tip size for the machine you actually run.
- Color tells you the spray angle: red 0°, yellow 15°, green 25°, white 40°, black 65° for low-pressure soap. A narrower angle concentrates the same water on a smaller area.
- The number stamped on a tip is its orifice size, which equals the gallons per minute it passes at 4,000 PSI. A 4.0 GPM, 4,000 PSI machine therefore takes a size 4.0 tip.
- Size the tip with one formula: tip size = GPM × √(4,000 ÷ PSI). A tip that is too small pushes pressure past the pump's rating; too large and pressure drops.
- High-pressure injection injuries can look like a small puncture at first and turn severe within hours. Never point any tip at skin, and get emergency care after any injection.
What Do the Pressure Washer Nozzle Colors Mean?
Each color is a fixed spray angle, and the angle decides how much force hits the surface. Start with the widest tip that does the job and only step narrower if you have to.
| Color | Angle | Best for | Avoid on |
|---|---|---|---|
| Red | 0° | Pinpoint blasting of stuck-on deposits on hard metal, from a distance | Concrete, wood, paint, vehicles, anything soft |
| Yellow | 15° | Stripping and heavy surface prep on durable surfaces | Wood, siding, vehicle finishes |
| Green | 25° | General commercial cleaning: equipment, dumpster pads, concrete | Delicate finishes at close range |
| White | 40° | Rinsing, fleet vehicles, siding, windows | Nothing in particular; it is the gentlest high-pressure tip |
| Black | 65° | Applying soap and degreaser at low pressure | Rinsing, because it is low pressure by design |
Rotary or "turbo" nozzles spin a 0° stream in a cone. They cut faster than a 15° tip but carry 0° force, so keep them off soft surfaces and away from sealed concrete edges.
What Do the Numbers on a Pressure Washer Nozzle Mean?
Most tips carry a five-digit code: the first two digits are the angle and the last three are the orifice size. A 25040 tip is a 25° spray with a size 4.0 orifice, and that size number is the flow in GPM the tip passes at 4,000 PSI.
To size a tip for any machine, use: tip size = GPM × √(4,000 ÷ PSI), then pick the nearest standard size. A tip that is too small restricts flow, so pressure climbs past the pump's rating and the unloader and pump work harder. A tip that is too large lets pressure fall, and cleaning slows down. Nozzle wear works the same way: as the orifice erodes it gets bigger, which is why a worn tip feels weak.
What Size Nozzle Does Your Pressure Washer Need?
Here is the formula applied to machines in our commercial pressure washer range. Always confirm against the machine manual.
| Machine | Rated PSI / GPM | Calculated | Tip size |
|---|---|---|---|
| Pressure-Pro Eagle EE2015G (electric) | 1,500 / 2.0 | 3.27 | 3.5 |
| Pressure-Pro Eagle II E3027HC | 2,700 / 3.0 | 3.65 | 3.5 |
| Pressure-Pro Eagle II EB5525HG | 2,500 / 5.5 | 6.96 | 7.0 |
| Pressure-Pro Hot Shot 4012-10C (hot water) | 4,000 / 4.0 | 4.00 | 4.0 |
| Pressure-Pro Eagle II E4042HC | 4,200 / 4.0 | 3.90 | 4.0 |
| Pressure-Pro Pro Super Skid 6012PRO-10G (hot water) | 4,000 / 5.5 | 5.50 | 5.5 |
Surface cleaners split flow across two or more nozzles on a spinning bar, so they are sized by the attachment maker, not with this chart. Match the attachment to the machine: the Dapper Supply 24" surface cleaner, for example, is listed at 2,500 PSI, and its maker recommends a machine of 2,500 PSI or higher.
Which Nozzle Should You Use for Common Commercial Jobs?
Use green 25° as the default working tip, white 40° for rinsing and vehicles, and black 65° to put chemistry down. Red and turbo tips are for specific hard-surface problems only.
| Job | Tip | Notes |
|---|---|---|
| Oil and grease on concrete | Black to apply degreaser, then 15° or 25°, or a surface cleaner | Degreaser and hot water do more than a narrower tip |
| Fleet and vehicle washing | Black for soap, 40° to rinse | Never 0° or turbo on paint |
| Heavy equipment and engine bays | Black for degreaser, 25° to rinse | Hot water speeds this up dramatically |
| Dumpster pads and trash corrals | 25° | Degreaser first where food grease builds up |
| Building exteriors and siding | 40° | Keep a steady distance; test first on painted surfaces |
| Large flatwork and parking areas | Surface cleaner | Even results and no wand stripes |
For stubborn oil, see our step-by-step guide on how to get oil stains out of concrete.
How Does the Black Soap Nozzle Work?
The black 65° tip has a large orifice that drops pressure at the wand, and that pressure drop is what lets a downstream chemical injector draw soap or degreaser into the stream. Switch back to a high-pressure tip and the injector stops drawing, so you can go from applying to rinsing without touching the chemical line.
Because the injector dilutes whatever it draws, mix concentrate in the siphon jug to land at label strength. The full mixing chart is in pressure washer soap vs degreaser.
What goes on through the black tip for grease and oil. Labeled for pressure washer application once mixed, 1:200 for routine grease, rinses residue-free with hot or cold water. Pre-dilute in the siphon jug to allow for injector draw.
Spot pre-treatment before you pick up the wand: spray it on greasy fittings or drip marks, give it 30 to 60 seconds, then rinse.
How Do You Use Pressure Washer Nozzles Safely?
Treat every tip as capable of cutting skin, lock the trigger before changing tips, and start wide. Most nozzle injuries happen during tip changes or when someone steps into the spray.
- Never point a tip at people or at your own hand or foot. A case report on high-pressure water injection injuries notes that patients seen early may have minimal symptoms and an innocuous entrance wound, and that the area can become extremely painful, swollen and pale hours later from vascular compromise (PMC, high-pressure water injection injury). Any injection needs emergency care.
- Engage the trigger lock before swapping tips and make sure the quick-connect has clicked fully home before you pull the trigger.
- Start with 40° and step narrower only if needed, testing on an inconspicuous spot first.
- Use GFCI protection on electric units. The CPSC has recalled electric pressure washers sold without an integral ground-fault circuit-interrupter because of shock and electrocution risk (CPSC recall notice).
- Keep wash water out of storm drains. EPA stormwater guidance recommends biodegradable, phosphate-free, water-based detergents used in limited amounts (EPA stormwater BMP).
Frequently Asked Questions
What color pressure washer nozzle is best for concrete?
Green 25° is the general-purpose choice, yellow 15° for tough spots on durable concrete, or a surface cleaner for large areas. Never use the red 0° tip on concrete, because it can etch lines into the surface.
What does the black pressure washer nozzle do?
It is the 65° low-pressure soap tip. Its large orifice drops pressure at the wand so a downstream injector can draw soap or degreaser into the stream. It is for applying chemistry, not for rinsing.
What size nozzle do I need for my pressure washer?
Use tip size = GPM × √(4,000 ÷ PSI) and round to the nearest standard size. A 4.0 GPM, 4,000 PSI machine takes a 4.0 tip, a 3.3 GPM, 3,500 PSI machine takes a 3.5, and a 5.5 GPM, 2,500 PSI machine takes a 7.0.
Which pressure washer nozzle is the strongest?
The red 0° tip, because it puts all of the water on a single point. That is also why it damages concrete, wood and paint, and why it is the most dangerous tip to handle carelessly.
Can the wrong nozzle damage a pressure washer?
Yes. A tip that is too small for the machine's flow pushes pressure above the pump's rating and makes the unloader and pump work harder. A tip that is too large does no damage but drops pressure and slows the job.
Related Guides
- What Is a Good Pressure Washer PSI? A Commercial Job Chart With GPM
- Pressure Washer Soap vs Degreaser: What to Use and How to Apply It
- How to Get Oil Stains Out of Concrete
- How to Clean a Concrete Floor
- Best Commercial Pressure Washer