An electrically insulating sheath for retaining electrical contacts in an electrical connector, the insulating sheath including an electrically non-conductive housing with a chamber defined therein. The chamber includes a pair of contact-receiving channels extending in an axial direction, each of the contact-receiving channels including a collar pocket for retaining the electrical contacts when inserted in the sheath. A dividing wall separates the contact-receiving channels from one another to reduce interference and crosstalk among the wires of the electrical contacts. The sheath includes a cover connected to the housing, the cover extending over at least a portion of the chamber.