Half circle hole near transmission leaking radiator fluid

[topshelfcollectors]

Hi guys, new to the forum and Galants in general. My girlfriend has a 2001 automatic v6 Galant that is leaking radiator fluid. There is a half circle shaped hole near the transmission where the fluid is leaking from. The hole doesn't appear to be threaded but maybe some type of gasket, plug, or hose goes there?

[topshelfcollectors]

I think I found the answer, freeze plug?

[spdracr]

Pictures will help us see what u r seeing.