A sprinkler nozzle is formed of a main body, an inner cap, and an outer cap. The inner cap and the outer cap are fastened to the main body which is connected to the water source. The inner cap is provided with a plurality of water admission holes various in form. The outer cap is provided with a plurality...http://www.google.com/patents/US6460782?utm_source=gb-gplus-sharePatent US6460782 - Sprinkler nozzle capable of emitting water in various patterns
