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A powerful spring pushes the steel disk situated in the hat (here at the left) and takes the grease by the opening situated in the body. The quality of regulation is limited by the variations of the grease consistence bound to the temperatures variations.

A small pin permits to maintain the compression disk in high position at the time of the replenishment and the positioning of the reservoir on its basis.

graisseur a pression ouvert

tete du graisseur

drawing of explanation and access to an advertisement of 1880 (in French)
      wanner pression brochure .