Hunter Sprinkler PGP04CVR PGP Ultra Pop-Up Reclaimed Water ID Sprinkler with Check Valve, 4-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