Muhsin is correct.? As I noted in my original reply, some 2.5mm connectors may work.? Some are designed with spring contacts, and are advertised as being compatible with 2.1mm.? And those do achieve a good contact.?
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However, Muhsin, if there are two choices in a connector for a QMX trigger cable, and one of them is 5.5/2.1mm, as is the case with buying most brands of trigger cables, the correct and best choice is ALWAYS the 5.5/2.1mm connector.? It will provide better performance over the long term, and will avoid confusion with 2.5mm connectors which don't have spring connectors, and are dangerous for use with QMX/QMX+.
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Stan KC7XE?
