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These very robust models  has the piston aimed in the oiler's body. The strength of lubrication pressure is manual. There is not utility tit is adapted for intermittent positive feed and for use whereever it is required to force grease some distance. It is all in brass and has no piece made of steel (spring, screw).
 It doesn't fear the navy athmosphere, then  Lunkenheimer named it   " MARINE " and     Powell    "COLONIAL"
old  Essex model marked on the top of the hat
Essex model recent the body is a stamped sheet
old Essex

essex oiler

essex ouvert a vis
to enlarge click on the picture to enlarge click on the picture
lunkenheimer greaser cup marine powell colonial greaser cup