This is a common as dirt 1/8 NPT plug used in all sorts of places on an airplane/engine. Ask around and just about anybody who has worked on an airplane or 2 should have these laying in a toolbox or junk drawer somewhere. also look at a speed shop like Summit, the corner auto parts store or the big box hardware places.
 
This is a common as dirt 1/8 NPT plug used in all sorts of places on an airplane/engine. Ask around and just about anybody who has worked on an airplane or 2 should have these laying in a toolbox or junk drawer somewhere. also look at a speed shop like Summit, the corner auto parts store or the big box hardware places.

"common as dirt" Hahahaha.

Thanks man, I needed the laugh. Thank you everyone for the info.