National Instruments Data Acquisition Device E Series - Manual (Page 227)

Appendix A Device-Specific Information
E Series User Manual A-92 ni.com
You can remove the Combicon plugs to assist in connecting wires.
Loosening the screws on either side of the two Combicon plugs allows you
to detach the Combicon plugs from the BNC DAQPad device, as shown in
Figure A-83.
Figure A-83. Removing the BNC Combicon