The MS9 compressed air preparation unit complements Festo's existing series of service units. The individual modules can be combined with one another and also with smaller sized modules, to create customised solutions. Thanks to its sturdy design, the MS9 is particularly suited to harsh environments and finds many applications in the automotive and food industries. The design stresses the individual modules that are divided by colored connectors. The manual on-off valve can be secured against unintentional operation by means of a padlock.