The Morrgrease Automatic Lubricator contains its own unique chemical expulsion unit. This has no springs or mechanisms but relies on an unvarying law of nature. Built into the top of each Morrgrease Automatic Lubricator is a flexible rubber expansion chamber containing a liquid electrolyte and a galvanic element. The unit is activated by injecting the galvanic element into the electrolyte. The resultant electro-chemical reaction generates a steadily increasing amount of gas, which gradually expands against a piston, to extrude the lubricant slowly but surely into the bearing to which the Morrgrease Automatic Lubricator is fitted. The chemicals and gas remain hermetically sealed within the expansion chamber so that no contamination of the lubricant can occur, even after the unit itself is spent. During the working life of the Morrgrease Automatic Lubricator, an indicating ring on the ejection piston shows through translucent windows in the body to enable the discharge state to be monitored.