The description of the Rainbird 1800 EXT 6" Spray Shaft Extension is confusing to me. I plan now to use Rainbird Spray Nozzles to water my schrubs. The current spray heads are mounted on 1/2 inch risers that I would like to replace and extend 6 inches. The description of the spray shaft extension states it "screws onto the shaft" and the "nozzle is attached to the top". Am I correct in assuming the the bottom of this extension is 1/2" female thread and will screw onto a 1/2 inch shrub stick with male pipe threads that is currently in place.
Nope, the shaft extensions are for RainBirds pop up sprinklers such as the 1800 series. What you need is a 1/2 inch threaded coupling and a short 1/2 inch riser. 5-6 inches long.