The 3500 Series Rotor is an easy to use short- to mid-range 1/2" gear-drive rotor, offering value and convenience for residential applications. Utilizing a simple flat-bladed screwdriver, the 3500's arc adjustment is quick and easy. This versatile rotor offers an attachable nozzle tree with six superior performing Rain Curtain nozzles, and the convenience of reversing full- and part-circle operation (up to 360 degrees) in one unit. Plus, a nozzle-removal feature and an easily removable filter screen make maintenance a breeze.