A lotion pump works by creating a vacuum with a piston or diaphragm. The pump is made up of several components, including a dip tube, a piston or diaphragm, a valve, and a nozzle.
When you press the pump, the piston or diaphragm is pushed down, creating a vacuum that draws the lotion up through the dip tube. The valve then opens, allowing the lotion to flow out of the nozzle and onto the skin.
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