Throughhardened stainless steel orifices provide wear resistance for long lasting performance. Colorcoded nozzle tips and their uses White 400 use on painted surfaces, wood siding, fences and lawn mowers Yellow 150 use on concrete, brick and other hard surfaces with stubborn stains Green 250 use on windows and screens Black 640 use to spray soaps and detergents Red 00 areas that are and hard to reach; clean crevices Important notes Since measurements are manual, slight measurement variation may occur Color appearance may vary slightly due to different screen displays Service and support We value our customers and your satisfaction is our priority If you have any questions, please contact us and we will work to resolve any issue you encounter Use scenarios Exterior cleaning: apply White 400 to painted surfaces, wood siding, fences and lawn mowers Deep cleaning hard surfaces: apply Yellow 150 on concrete and brick to tackle stubborn stains Detail work and reach: use Green 250 for windows and screens, and Red 00 for , hardtoreach areas and tight crevices