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Grease guns are lubrication applicators designed to dispense a controlled amount of grease to a specific target area. They generally consist of a cylindrical barrel with a plunger that pushes the grease out of the nozzle. Manual grease guns have levers or pistol grips that rely on the physical effort of the user to squeeze the grease out. Air-powered or pneumatic grease guns use compressed air to displace grease while battery-operated grease guns depend on direct current for operation. Grease guns have different capacities and are used to keep moving parts of machinery lubricated.