Abstract: A cable insertion device comprising a seat having an opening, and an engagement portion extending peripherally around the opening axis, the engagement portion having an outer surface and, recessed relative thereto, an inner surface. The engagement portion is circularly segmented into grip jaws capable of elastic deformation by slots extending right up to the seat. At their connection with the seat, the grip jaws are each fixed therein along a fixing zone tangent to a circumference centered on the seat opening axis, and, with the engagement portion, which is made of relatively rigid material, is associated a sealing member, extending globally transverse relative to the seat opening axis, concealing at least partially the opening, and the sealing member is made of a relatively flexible material. The invention is useful, in particular, for equipping any chamber, such as a cabinet or the like.