A partially metallized film having a dyed region and a transparent region alternately at an each regular interval on a major surface thereof is useful as a security thread to be embedded in a security paper. The closing system provides lubrication for a piston rod without a need for periodic replenishment. Accordingly, while a breaker body is moved to a \u2018RUN\u2019 position from a \u2018TEST\u2019 position, or when an operation is performed at a \u2018RUN\u2019 position, the plug may be prevented from being separated from the connector. If the container alarms in one or more areas, the areas are subjected to a secondary scan. A bag, similar in design to the conventional vacuum bag, is connected to the back of the unit.