How to identify ISO A and ISO B quick couplings and their body size

Ball-lock mechanical quick coupling, usually under ISO7241 standard. They can be divided into A series and B series. There are some simple ways to distinguish whether a quick coupling belongs to the A series or B series. The body size of the quick coupling can be determined by the diameter of the male coupler. This will help the user to quickly find an interchangeable quick-release coupling.
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