This Gilmour lawn sprinkler has a height adjustable ring to control the spray distance as the sprayer rotates so it can accommodate non-circular areas and avoid wasting water.  After years of use, the ring (black) failed as shown in pictures.  Repair parts are not available.  I designed and printed a replacement ring from PETG.  I used clear filament because some pigments weaken the layer to layer bonding.  This part can be printed without supports.  I used a 0.20 layer height and 18 perimeters to maximize strength of the thin flexible portion.  Printing with fan off can improve PETG strength.  STEP and SolidWorks files are provided in addition to STL.