an impact sprinkler having several specific features is disclosed herein . one such feature resides in the use of a plastic water deflector having a number of cooperating water deflecting surfaces which improve the overall water distribution pattern of the sprinkler , specifically at the outlying areas of the pattern . another feature of the sprinkler disclosed herein resides in the particular configuration provided for allowing the water deflector to pibot vack and forth . regarding this second feature , the sprinkler disclosed herein typically includes a journal pin about which the water deflector can pivot . located between this pin and the water deflector is at least one longitudinally extending slotted passage open at opposite ends . this passage provides a path through which abrasive material can escape should such material get lodged between the pin and deflector .