The AL 15 series is a pressure-fed external mix flat fan spray nozzle. The external mix feature allows control of the atomisation without changing liquid flow. The lighter the air pressure, the higher the atomisation for a given liquid pressure (types 15-06 to 15-11). Types 15-01 to 15-05 are siphon type. The spray pattern is a function of pressure. The higher the air pressure, the longer the spray pattern.