12 in. 5000 Series Part-Circle Pattern Pop-up Rotor with PRS Pressure Regulation and SAM Check Valve | Faster maintenance with a new self-cleaning arc adjustment screw | Heavy-duty cover assembly for extra durability - Rain Curtain Nozzles | Slip clutch mechanism for quick adjustment on installation - Heavy-duty retract spring assures positive pop-down | Top-adjust arc adjustment requiring only a flat-blade screwdriver - 40 - 360 Degree arc rotation and reversing full circle rotation in one