Abstract: A nozzle assembly for an irrigation apparatus having a conical nozzle body mountable on the discharge pipe of the irrigation apparatus. The nozzle assembly is also provided with a set of interchangeable tip members of different sizes to permit variation in the flow rate of the nozzle assembly. The flow passages through the individual tip members are of uniform slope with the nozzle body, and the discharge orifices in the tip members are formed directly at the free ends thereof, to ensure that the discharged stream is properly broken up and uniformly dispersed over the irrigation area.