With an extended throw distance of up to 38 feet plus superior coverage uniformity, the Rain Bird 42SA gear-drive rotor is an ideal upgrade for large zones where greener, healthier grass is desired. The rotor adjusts easily at the top with a flat blade screwdriver to ensure that you"re watering only things that grow, not the house, sidewalk, or driveway. Installation is simple: the 42SA mounts on a standard 3/4-inch riser for simple replacement of older rotors, and provides a true 4-inch pop-up height to clear taller grass. The rotor also includes a water-lubricated, gear-driven design that provides long-lasting dependability, along with a dual-action, positive-stop wiper seal that protects internals from debris and assures positive pop-up and retraction to save water. The 42SA"s Rain Curtain nozzle ensures uniform coverage. (View larger). The sprinkler head adjusts from 40 to 360 degrees using a flat head screwdriver. (View larger). Rain Curtain Nozzle Technology Among the 42SA"s rotor advances is its Rain Curtain nozzle design, which produces larger water droplets that fall exactly where you want them, resisting windblown overspray. The nozzle"s "micro ramps" also direct a portion of the spray close to the head, eliminating the dry brown spots common with other brands. The nozzle"s superior coverage uniformity helps you reduce watering time on your rotor zone, saving money on water bills. Adjusting Arc To set up the 42SA sprinkler"s rotation (arc), turn on the water and rotate the shaft by hand to the right until it stops, and then to the left until it stops. That is your fixed left edge. Then turn the entire rotor until it is lined up with where you want the sprinkling pattern to start on that left edge. The rotor is preset at the factory to rotate 180 degrees from that left starting point. To change the arc from its preset rotation, make final adjustments with the top screw using a screwdriver, increasing or decreasing as desired. Adjustable Spray Distance The rotor comes with a 3.0 GPM nozzle rated to a throw distance of up to 38 feet at common residential water pressure (45 PSI). You can reduce the throw distance up to 25 percent by turning the screw located above the nozzle using a flat blade screwdriver. Other features include a protected closed-case design that makes the sprinkler ideal for "creeping" grasses, sandy soil, and other harsh surroundings; a reversing full and part circle rotation from 40 to 360 degrees; additional O-rings and seals for extra protection in "gritty" water; and a self-adjusting stator that doesn"t require replacement when changing nozzles.