AC3200, R8000 New Power supply? What size pin?

I can't seem to figure out what original power supply came with this router.  Got it from a friend less than a year old but the power cord was lost in a few moves. I purchased a universal howerver that did not solve the issue, the actual plug into the back of the router is incorrect. Is it a 6.5mm jack? I can't tell!  I at least got that it needs 19v and 3.16amps