Abstract: Improvements in an oscillating sprinkler having an improved discharge of fluid wherein the fluid being discharged enters two side by side curved chambers and is split into two separate streams. The spring controlling the oscillation of the sprinkler is centered on the impact arm of the sprinkler by a spring retainer and a boss on the arm itself so as to provide a smooth transition for the water and disperse it evenly with less operating pressure. The arm may have a removable reactor spoon portion so that the spoon portion can be quickly and easily replaced, if desired.