Grease gun

A grease gun is a common workshop and garage tool used for lubrication. The purpose of the grease gun is to apply lubricant through an aperture to a specific point, usually from a grease cartridge to a grease fitting. The channels behind the grease fitting lead to where the lubrication is needed.

The aperture may be of a type that fits closely with a receiving aperture on any number of mechanical devices.
The close fitting of the apertures ensures that lubricant is applied only where needed.
There are four types of grease gun:Hand-powered, where the grease is forced from the aperture by back-pressure built up by hand-cranking the trigger mechanism of the gun, which applies pressure to a spring mechanism behind the lubricant, thus forcing grease through the aperture.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain