The pressure plate is what applies pressure to your clutch plate !!
which transfer the engine power to your tranny
when you put your foots on the clutch it releases the pressure of the pressure plate on the clutch plate which allows you to change gears so forth , disengageing the power from the engine to the tranny.
After market ones are either different brands ,can be argued of quiality ,or stronger ones for when you make mods to your engine .
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