Coolant is pouring out as fast as I add it?

Yes, that is a threaded gallery plug. If it is leaking that badly it needs to be replaced. You would drain the coolant, then use a proper sized hex wrench to break that one free and remove it. Then you clean the corrosion and crud from the hole. Once clean you apply thread sealant and install the new plug.

Do you know where I can find one like this that isn't plastic? No luck from my local AutoZone.

I generally use OEM parts when possible.

I finally located one thats OEM. Its just a solid metal plug with no seal. Im wondering how coolant can just pour out like that when its plugged? There's no holes in it. What seals it?

You apply a thin coating of thread sealant to the threads, then it gets screwed in. Then you let the sealant cure. Then fill it. The interface of the threads with the sealant stops the leaks. If you want to see real oddities look at the conventional disc type freeze plugs. They machine the hole so it's round with a ledge, then you put a tiny amount of 3M sealant on the edge of the plug. Put it in place and use a hammer and punch to compress the dome in and force it to lock into the hole. The cooling system is only subjected to about 20 psi maximum as a worst case, so it really doesn't take a lot to seal it. What commonly happens is the coolant doesn't get changed or people run straight water, and they rust out from the inside.

Oh wow, but that makes sense. I have seen the conventional disc ones. I've seen people use a flat head screwdriver and knock a hole in it and then you a small pry bar to pull it out and then they put some sealant around the new one and use a socket just big enough to sit inside of it and hammer it in.

Yes, that is the process. They rarely fail but just about every failed one I've dealt with was for corrosion.

Gotcha. Hopefully, I can do this myself without having to move a lot of stuff. Hopefully getting the old one out won't be too bad. I assume counterclockwise loosens.

Yep, lefty loosey, righty tighty. There isn't really a torque spec on them, just in tight so they seat properly.

Okay, perfect I'll let ya know.

Do you happen to know what size hex head it is?

I generally just grab one that looks right while working. From the image I would think it's between 15 and 17 mm but I don't have one to check. They are not a common replacement item.

The new plug is in. I used the Permatex water pump and gasket sealer. There's no weeding on how long it takes to fully cure but I did lay it on thick. Do you know the amount of time?

Normally I wait at least a couple hours with that.