Pressure Washer Nozzle Guide: Which Tip for Which Job?
Using the wrong pressure washer nozzle can strip paint, gouge wood, or waste hours on a job. We explain every color-coded tip and exactly where to use it.
Understanding the Color Code
STIHL and most pressure washer manufacturers follow a universal color code for nozzles. The color indicates the spray angle, which determines how concentrated or dispersed the water stream is. A narrower angle means higher pressure at the point of impact, while a wider angle spreads pressure over a larger area.
The red 0-degree tip is a pencil-thin jet of water at maximum pressure. It is rarely used for cleaning and primarily serves to blast out deep cracks or strip heavy rust. The yellow 15-degree tip is your heavy-duty cleaning nozzle for concrete, brick, and metal. The green 25-degree tip is the general-purpose workhorse for siding, decks, and vehicles. The white 40-degree tip is the gentle option for windows, soft wood, and delicate surfaces. The black nozzle is the low-pressure soap applicator.
Matching Nozzle to Surface
Concrete driveways and patios respond well to the 15-degree yellow tip at close range. Keep the nozzle 6-8 inches from the surface and move in consistent overlapping passes. For mold and mildew on siding, the 25-degree green tip at 12-16 inches prevents water from being driven behind the panels while still providing enough force to lift growth.
Wooden decks require caution. Even with the 25-degree tip, excessive pressure or too-close proximity can etch soft wood grain. Start at the maximum recommended distance and test an inconspicuous corner. Vehicles should only see the 40-degree white tip or a foam cannon — never use yellow or red tips on automotive paint unless you intend to strip it.
Nozzle Maintenance and Safety
Inspect nozzles before every use. A partially clogged nozzle creates uneven pressure that can damage surfaces and strain the pump. Clear debris with a thin wire or needle, then flush with clean water. Never point any nozzle at people, pets, or windows at close range — even the 40-degree white tip can cause injury or breakage at point-blank distance.
When switching nozzles, always shut off the pressure washer and squeeze the trigger to release trapped pressure. Quick-connect fittings make nozzle changes fast, but residual pressure can forcefully eject a loose fitting. Store nozzles in a dedicated case to prevent the orifices from being damaged by impact or corrosion.