I just got an hks sequential blow off valve from japan and the directions are in japanese. What does the "B" and "A" stand for next to the top nut?

 

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i'm not quiet sure...but one thing i am sure...i read somewere in the manual that if u loosen that screw, ***** inside may get disasemble...

just look for some of the topic here in the forum..i remember seing the manual for this sbov..

one thing for sure..it wont make much WHOOSH hehhe... i should of gotten ssbov..doup!