Rainbird 5000 Plus Series Part/Reserve Full Circle Rotor with Seal-A-Matic and NP Cover, 6" 6 in. 5000 Series Part/Full-Circle Pattern Pop-up Rotor with SAM Check Valve and Flow Shut-Off 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