In my curiosity

I took out the air-adjustment screw just to chech that darn little thin. There is a little O-ring "on top", whitch seems to just hang there. Is this ring suppose to be pulled down so it stuck, or shall it just keep on hanging there??? By the way - do anyone know where to get a new "pakning" for the brake-oil dispenser on the bar (dont know the english word for that rubber thing thats under the cover that keeps it from leeking etc.)