This is my very own design. I have put this nozzle assembly together using only the highest quality spray parts available to me. This nozzle assembly will allow you to spray approximately 8 feet wide making fast work of any lawn application! If you do not have a battery powered sprayer make sure to pick up the STROM BATTERY SPRAYER. I have done the testing and calibration for you so its makes the options EASY! When you purchase this Sprayer Nozzle Assembly you will receive a video teaching you how to calibrated it.