Rain Bird Rotor Heads 5000 Rotor Sprinkler Heads. 4-Pack 4" pop-up part circle rotor, 3/4" inlet 40-360 arc rotation and reversing full-circle rotation; Radius: 25 to 50 feet Top-adjust arc adjustment requiring only a flathead screwdriver Heavy-duty retract spring assures positive pop-down 3.0 GPM nozzle pre-installed; no additional nozzles provided