Hunter Sprinkler PGP12CVR40 PGP Ultra Pop-Up Reclaimed Water ID Sprinkler with Check Valve and Model 4 Nozzle, 12-Inch Most notable improvements of the PGP Ultra is its non-strippable drive and automatic arc return Other advanced features include 22 nozzle options with several radius choices and a headed slot and set screw The diversity of the PGP Ultra offers system installers an array of efficient options on any site