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In a pressure washer, the plunger pump puts out a constant volume of water. Regardless of whether you've set your unit to pump out at high pressure or low pressure the same amount of water passes through. Most people adjust the pressure on the nozzle when power washing, depending on the type of pressure they want. But if you want a quick adjustment without interrupting what you're doing, all you need to do is adjust the distance between your nozzle and the surface you're spraying.