Embodiments of a securing system for plug connectors may have an adapter and a pair of housing parts, each with at least one plug place with a plug place interface for receiving the adapter whose exterior may have an adapter interface for positioning in the plug space. The adapter may have an interior geometry for receiving a plug connector. The exterior of the adapter and the plug place may form a primary securing means for securing the adapter in the respective plug place when the adapter is inserted into a defined plug position to secure the adapter in the plug place. Embodiments may include a secondary securing means, which can be plugged into the housing part up to a defined end position at which the secondary securing device to secure the plug connector in the adapter.