Irritrol 550R Gear Driven Rotor, 3/4' by 5" Familiar top adjustment, wet or dry - For fast convenient installation Reversing full- and part-circle operation - Allows you to adjust the rotor from 40 to 360 Non-flushing wiper seal - Reduces leaks caused by debris trapped under seal All adjustments made with a standard screwdriver - No special tools required Wide selection of nozzles - 8 standard and 4 low angle nozzles included with each rotor to handle a wide range of applications