Stens pressure washer nozzles deliver a strong and consistent stream of water for a variety of jobs. The nozzles deliver the water stream in a rotational motion that cleans with exceptional uniformity. Select your nozzle based on the job you need to do. Each nozzle is shown with the degree at which it delivers the stream of water. The red zero-degree nozzles deliver a very forceful stream of water thats highly effective for removing stubborn dirt or debris. However, the force of the water can be damaging to softer materials such as wood or siding, so it should only be used on hard metals, concrete or other hardscape materials. The yellow 15-degree nozzles are ideal for removing mildew, dirt, oil, grease, stains or peeling paint on harder surfaces. The green 25-degree nozzles are commonly used for cleaning tasks such as washing dirt off pavement, fences, decks and siding. The white 40-degree nozzles offer low pressure spraying for cleaning surfaces that might be damaged with higher pressure such as screens and windows. The black nozzles are low pressure for applying soaps and detergents while cleaning. These statements should be used as a guide when selecting a nozzle. As a precaution, you should always test the spraying force in a location thats not highly visible or on an extra piece of similar material