Lawn sprinkler heads come in a variety of sizes, shapes, patterns and spray ranges.  Generally installed underground and connected to a series of underground pipes which transfer water from the water source to the nozzle or outlet of the sprinkler head.  Sprinkler heads generally incorporate interchangeable nozzles or tips, which control the amount of water that flows through the sprinkler head as well as the distance the arc of water will spray.  Sprinkler heads generally spray between 7 and 17 feet.  Installed nozzles can be either fixed pattern or adjustable depending on the application.