Pressure Washer Nozzle Colours Explained

The colour on a pressure washer nozzle is a shorthand for its spray angle, and the spray angle is what decides how hard the water lands. Red is the narrowest and most aggressive at 0 degrees, black is the widest and softest at around 65 degrees, and yellow, green and white sit in between. Pick the wrong one and you either spend an hour achieving nothing or leave permanent stripes in your paving.

The colour code at a glance

Most quick connect nozzles sold in the US follow the same industry convention:

• Red, 0 degrees: a single pencil jet. Maximum force, tiny cleaning area.
• Yellow, 15 degrees: heavy stripping and hard surface work.
• Green, 25 degrees: the general purpose tip for most outdoor jobs.
• White, 40 degrees: gentle rinsing over a wide area.
• Black, 65 degrees: low pressure soap nozzle for applying detergent.

You may also see a turbo or rotary nozzle, often red or unmarked, which spins a 0 degree jet in a cone. Some kits add a brass or grey tip for a specific accessory.

Why the angle matters so much

Your pump delivers roughly the same pressure and flow no matter which tip you fit. What changes is how that energy is spread out. A 0 degree jet concentrates everything into a spot the size of a pea, so the force per square centimetre is enormous. A 40 degree fan spreads the same water across a band several inches wide, so each part of the surface gets a fraction of the impact.

That trade off runs both ways. Narrow tips hit harder but clean a strip so thin that doing a whole patio would take all weekend and leave visible lines. Wide tips cover ground fast but may not shift ingrained dirt. The skill is picking the widest angle that still does the job.

Red, 0 degrees

Genuinely useful in very few situations. It will remove a stubborn tar spot, blast caked mud out of a wheel arch on machinery, or clear a blocked drain gully. On anything softer it does damage almost instantly. Never point it at render, timber, uPVC, window seals, vehicle paint or a person. If you are not sure whether you need red, you do not need red.

Yellow, 15 degrees

The stripping tip. Good for lifting flaking paint, thick algae on concrete, or grease off a workshop floor. It covers a usable strip, but it still bites hard, so keep it moving and stay well back. On block paving it will wash out jointing sand very quickly.

Green, 25 degrees

If you only ever use one tip, this is the one. It handles patios, decking, fences, garden furniture, wheelie bins and driveways with a sane balance of speed and force. It is aggressive enough to clear green algae and general grime without carving into most surfaces, and the fan is wide enough that overlapping passes blend rather than stripe.

White, 40 degrees

The rinsing and finishing tip. Use it for cars, windows, delicate render, soffits, garden furniture, and for rinsing detergent off anything. It rarely damages a surface at a normal working distance, which makes it a safe starting point when you are cleaning something for the first time.

Black, 65 degrees

The odd one out. The black nozzle has a much larger internal orifice, which drops the pressure at the tip and lets the machine draw detergent through its soap system. It is not a cleaning tip, it is a delivery tip. If your detergent will not siphon, the black nozzle is usually the first thing to check, because most machines simply will not pull soap through a high pressure tip.

Turbo and dirt blaster nozzles

A turbo nozzle spins a 0 degree jet in a fast circle, giving roughly the impact of red across roughly the coverage of a 25 degree fan. It is brilliant on concrete and stone and it will strip a filthy driveway far faster than anything else. It is also the tip most likely to ruin soft surfaces, so keep it away from timber, render and anything painted.

What if your machine has no coloured tips?

Plenty of domestic machines, Karcher in particular, use a proprietary bayonet lance rather than a standard quick connect fitting. Instead of five colours you get an adjustable vario lance that twists between a narrow jet and a wide fan, plus a separate dirt blaster. The principle is identical: twisting towards the pencil jet is the same as fitting red, twisting towards the fan is the same as fitting white.

Matching the nozzle to the job

1. Cars and vans: white for the whole wash, black for the snow foam stage. Never yellow or red.
2. Patios and paths: green for general work, turbo for heavily soiled concrete.
3. Block paving: green at a shallow angle, or you will empty the joints.
4. Decking and fences: white or green, always working along the grain.
5. Render and painted walls: white only, and stand well back.
6. Gutters and soffits: white, or a dedicated gutter attachment.

Looking after your nozzles

Nozzles wear. The orifice slowly erodes and widens, which quietly drops your working pressure over months of use, and it is easy to blame the pump when the tip is the culprit. Grit is the other common issue: a partially blocked tip gives an uneven or split fan pattern. Clear it with the cleaning pin supplied with the machine, never a drill bit or a nail, then rinse it through.