Abstract: For use with an irrigation sprinkler, an interchangeable nozzle apparatus is provided which includes a tubular housing mounted at the discharge end of the sprinkler, and arranged to receive any of a plurality of insert members which may be selected for controlling the flow rate of water ejected from the nozzle, controlling the distribution of water over the range of throw of the sprinkler, or enhancing the range of throw of the sprinkler when water is supplied to the sprinkler at relatively low pressures. In part-circle applications on a reaction drive type sprinkler, the inserts are arranged to limit movement of the reverse drive arm into the stream of water ejected from the nozzle by an amount dependent upon the nozzle size, thereby resulting in substantially the same reversing force regardless of nozzle size.

Abstract: An improved water sprinkler of the arm driven type which has a reverse drive arm movable into the water stream emerging from a replaceable nozzle, to provide rapid reverse rotation of the sprinkler. The improvement lies in a novel nozzle structure which limits movement of the reverse drive arm by an amount dependent upon the nozzle size, thereby resulting in substantially the same reversing force regardless of nozzle size.