Toro MINI8 1/2" Threaded 4" Pop-Up Top Arc Indication Ensures easy adjustments from 40 Degree to 360 Degree with visual feedback of arc change by reading the scale Part And Full Circle In One Offers convenience and reduces inventory requirements Pressure Activated Seal Minimizes flow-by during pop-up and keeps debris away from stem during retraction Stainless Steel Radius Adjustment Screw Allows up to 25% reduction Five Interchangeable Nozzles To cover varying flow and radius requirements (comes pre-installed with a 1.5 nozzle)