EXELAIR by Milton’s Simply Better Air® system provides the best solution to manage compressed air. Milton’s 3/4" and 1” FRL Modular Connector (S-1163-51C): Used to connect high flow FRL components together without hard piping. Bracket includes two holes that can be used as screw holes when attaching to a wall. Modular connectors allow for easy service and replacement by simply unscrewing top screw and removing component. The center opening of this modular connector includes a rubber O-ring which provides a tight seal between FRL components. Includes wall mount brackets and hardware.