A dip stick assembly is disclosed which includes a sealing sleeve member attached to the end of the dip stick handle which is adapted to extend into an access tube and frictionally engage the interior thereof to prevent loosening of the dip stick and to facilitate sealing against the escape of vapors...http://www.google.com/patents/US3991476?utm_source=gb-gplus-sharePatent US3991476 - Dip stick with sealing sleeve
