Adjustable shrub risers with adjustable nozzles allow you to adjust the riser height according to the future growth of the shrubs. While this can be accomplished with traditional PVC risers and couplings, the adjustable shrub riser is made from durable aluminum and features a locking nut which permits you to telescope the riser up or down in fine increments. The riser inlet is 1/2" male pipe thread (MPT) and you will typically insert it into a 1/2" PVC Tee or Elbow underground. The adjustable pattern nozzles permit arc adjustment from 0 to 360 degrees and radius adjustment down to 50% of the rated distance and are replaceable with all Orbit, Hydro-Rain and female-thread nozzles, as well as nozzles from other major manufacturers.