Airmax Fountain Spray Pattern Nozzle lets you customize the look of your fountain with a variety of spray patterns, including Single Arch, Double Arch, Double Arch & Geyser, and Blossom (Crown & Arch). Installation is easy: simply unscrew the nozzle nut, remove the current spray pattern, and replace it with the new one. The nozzle nut should be tightened by hand only. Some patterns require a Flow Straightener, which is included with the pattern, to be inserted into the top of the Discharge Horn before the nozzle. Enjoy your newly installed spray pattern!