Rear end wrench

Can anyone tell me what wrench or socket I need to remove the plug on my 65 Valiant convertible?
I ment to sa
Just pop the drive of a 1/2 inch ratchet wrench into the hex-looking thing and screw it out.
Just pop the drive of a 1/2 inch ratchet wrench into the hex-looking thing and screw it out.
Thanks I did not try that.