A plug connector assembly for mating with a mating connector including a plug connector comprising an insulative cover defining a receiving space, a printed circuit board (PCB) received in the insulative cover, a mating member mounted on the insulative cover and electrically connected with the PCB, and a front stopple; and a cable connected to the plug connector; wherein the insulative cover comprises a front port and an opposite rear port for the cable to extend through, a channel extends from the front port to the rear port and is connected with the receiving space to extend the mating member out of the insulative cover, and the front stopple fills the front port and the channel.