Tractor Sizing Y380T Engine Drain Plug Thread Size?

[ToolManRick]

Dang drain plug is dripping a bit after the last oil change and I'd like to replace it with something like a PARKER #VSTI1/4EDA3C embedded seal plug rather than the copper ring at the next change. I suppose I could wait till then to measure it, but would like to have one on hand when I do the oil change. Thanks for any help.