Abstract: A water sprinkler which includes a casing and an oscillatory sprinkler head mounted on the casing. The casing includes a water inlet and two water outlet paths. Within the casing there is a structure which cyclically connects the water inlet first to one outlet path and then to the other. The oscillatory sprinkler head includes two spray nozzles which direct water generally tangentially. The nozzles are arranged so that the reaction force when water flows from one nozzle rotates the sprinkler head in one direction and when water flows from the other nozzle the sprinkler head is rotated in the other direction. Each nozzle is in communication with a respective one of the outlet paths. The angle through which the sprinkler head moves can be adjusted.