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A hydraulic bottle jack is a device used to lift heavy objects using hydraulic pressure. It consists of a cylindrical body, known as the bottle, with a flat base and a piston connected to a handle on top. When the handle is pumped, hydraulic fluid is drawn into the jack, causing the piston to rise and lift the load. The hydraulic pressure creates a strong lifting force, making it a popular tool for lifting cars, trucks, and other heavy machinery.