You cannot shutoff the spray on the MP Rotator nozzle using the radius adjustment screw. To shut off spray to one head within a zone, you would need to cap off the head at a PVC level or install a Pro Spray Shutoff Cap PN 213600SP (if a Pro Spray head is installed). The Pro Spray shutoff cap can be purchased through your local Hunter distributor. Click here for more information on capping off sprinkler heads.
You can now also cap off the head at the nozzle using the Shut-off Nozzle, p/n 916400SP, which allows for the shut-off of PS Ultras as well as Pro Sprays.