Plug and coupling assembly

Abstract

A plug has a cavity and a front opening and a rear opening located at two opposite ends of the cavity. The plug includes a plug main body, a plug rear terminal, and a piston. The plug main body includes a circumferential hook raised from an outer surface of the plug main body. The front opening defines a front end surface of the plug main body. The plug rear terminal is connected to the plug main body. The rear opening is located at an end of the plug rear terminal away from the plug main body. The piston is disposed in the cavity. The piston includes a piston main body, a piston head, and at least three extending portions. The piston main body has a cone surface. The piston head is disposed on the piston main body. The at least three extending portions are connected to the cone surface of the piston main body. The at least three extending portions extend away from the piston head from the cone surface of the piston main body. A notch is defined among the at least three extending portions and is located at a side of the piston main body away from the piston head.

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