when {HEAD ~ the plug body} is locked to the associated socket by means of said locking mechanism, said cam member is externally driven to cooperate with said tapered surface, thereby moving the main cylindrical member and the inner cylindrical member relative to each other in {TAIL ~ the axial direction} of the housing sections and bringing said plug body and said rear cylindrical member into contact with each other in the axial direction thereof 
when { HEAD ~ the plug body } is locked to the associated socket by means of said locking mechanism , said cam member is externally driven to cooperate with said tapered surface , thereby moving the main cylindrical member and the inner cylindrical member relative to each other in { TAIL ~ the axial direction } of the housing sections and bringing said plug body and said rear cylindrical member into contact with each other in the axial direction thereof
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