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Draw the main line from the location where your plan to install your control valves, time (if automatically operated), and backflow preventer. Draw branch lines from the main line to each head. You can route a branch line to more than one head if you use a 3â4 inch (1.9 cm) pipe, but two should be the limit.
The spray radius adjustment is the easier of the two to adjust: Turn the adjustment screw clockwise with a flat-head screwdriver to reduce the radius -- this drives the screw into the spray and disrupts the water flow.Turning the screw counterclockwise has the opposite effect.djustment Tips. When adjusting sprinklers while the water is on, the best strategy is to stay out of the water flow. You're bound to get a little wet, though, so wear appropriate clothing. You should adjust the sprinklers so all parts of your lawn or garden get water.