Attributes . Arc Setting Factory Preset At 180 Degrees for Installation Convenience, Dual Action, Easily Removable Filter Screen, Nozzle Removal Feature, Positive Stop Wiper Seal Protects Internals From Debris and Assures Positive Pop-Up and Retraction, Quick Check Arc/Fast Forward, Radius Adjustment Screw Allows Up to 35% Radius Reduction Without Changing Nozzles, Reliable Operation, Self-Adjusting Stator Does Not Require Replacement When Changing Nozzles, Top-Adjust Arc Adjustment Requiring Only A Flat- Blade Screwdriver, Water-Lubricated Gear-Drive Design for Durable . Names