drain valve on radiator---how to undo it?

[mdmula]

Yes sir this is the radiator drain plug. It is plastic so be careful when opening and closing it. Do not over torque it or it will break off at the point where the hex head meets the threaded shaft (this is first hand experience.) If you do break the head off, use an allen wrench to remove it and replace it. Believe it or not a mechanic wanted to remove the radiator to replace mine.