Series ZFC5* and ZFC7* are in-line air filters that prevent trouble in equipment caused by contaminants in the air.? Both positive pressure and vacuum pressure can be used with a single unit. During positive pressure, a lock mechanism prevents components from being scattered when they are loosened. The ZFC series is light weight and compact, and the flexible mounting orientation makes it easy to install to the line. The ZFC is available in 5 metric sizes and 4 inch sizes.