Nelson Replacement Underground Pop-Up Rotor Sprinkler 6000R Replaces all Nelson and most competitive gear drive underground rotor sprinklers Proven reliability of the water-driven gear motor CLICK-SET collars are quick and easy to adjust and provide a continuous 360 degrees rotation or part-circle adjustable 40 degrees to 310 degrees NIR2 feature (Nozzle Insertion Radius Reduction) eliminates the need to remove the cap for adjustments Eight interchangeable ACU-COVER nozzles ranging from 1.0 to 9.5 gpm included