From MH Connectors, A range of RJ45 Couplers available Shielded or Unshielded in various Categories. Each coupler is highly reliable and excellent quality.
821-2911 RJ45 Coupler - Unshielded Ethernet 821-2920 RJ45 Coupler - Shielded Ethernet
821-2923 RJ45 Coupler - Unshielded Cat 5e
821-2927 RJ45 Coupler - Shielded Cat 5e
821-2936 RJ45 Coupler - Unshielded Cat6 with offset pin
821-2939 RJ45 Coupler - Shielded Cat6a with offset pin