threaded hole in rocker cover?

hi
ive recently jus started cleanin my rocker cover up (it was covered in oil) and ive noticed that there was a threaded hole in it, near one of the pipes (breather i think not sure) ive takin some pics, nd was wondering if any1 new y it was there, nd wat shud b in it, cause a hole cnt b a gd thing
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thanks
steve
 
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