DC Barrel Connector and Plug 2.1mm Panel Mount
Standard 2.1mm DC Jack / Barrel Connector Type Kit.
This kit includes a panel mount outlet port with 13.8mm face diameter (requires 12mm mounting hole) and the standard 2.1mm cable connector (plug).
The outlet comes with an NC contact to disconnect a second power supply when the plug is inserted.
Specification: DC Barrel Connector and Plug 2.1mm Panel Mount