To adjust the spray on the Pop-Up Spray Head 1800 Series, follow these steps: Turn off the water supply to the sprinkler system. Locate the adjustment screw on the top of the spray head. Use a flathead screwdriver to turn the adjustment screw. Turning it clockwise will decrease the spray distance, while turning it counterclockwise will increase the spray distance. Test the spray pattern by turning the water supply back on and making any additional adjustments as needed.