Drain rooster

well my antifreeze was nasty, im praying its not the leak but it is brown and stuff so i decided to flush and replace, but unlike my jeep who has a giant wingnut style drainrooster down in the bottom of the tank, this one does not, and if it does im not finding it--where is it?> thanks

i think i found it but now it looks like i need a special tool?
im a pretty decent driveway mech. but the only ones ive ever seen were ones that looked like wingnuts,, why does gm have to be diff?
lol if anyone has anyidea what i use to remove this thing let me know please
it almost looks like it needs a 1/4 in ratchet head to fit in it, but i tried that and it just started striping the plastic pice---wtf'?

just disconnect the lower radiator hose where it goes into the radiator. That'll work won't it?

ya but then it wont drain the lower tank ---?>