Some installers will use these heads in spaces that are too small for efficient rotor operation. These installers attempt to reduce the number of heads and piping connections, thus reducing trenching and labor costs. The nozzle is the device that water passes through as it is leaving the head and is to be dispersed onto the landscape. Irrigators rely on different nozzles to vary the quantity of water dispersed during the watering cycle, as well as the distance that water is to be thrown by each head. The amount of water distributed over a given area per minute can be doubled or tripled by choosing the correct nozzle.
Spray nozzles come in varying sizes and patterns, depending upon the manufacturer.
If selected and installed properly, they form a spray pattern that will provide a uniform application of water over a given area. Years of research is behind every new nozzle before it is released into the marketplace. Rotary nozzles usually are inserted into the body of the head after it has been installed. Available nozzle sizes vary with each manufacturer. Uniform and complete coverage depends on selection of an appropriate nozzle for the area to be covered.