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The Constant Pressure System or CPS works like this; You pump the gun. The pressure forces water thourgh the one way check valve into the CPS Chamber, which is a rubber chamber inside a plastic one. Pressure and water accumalate in the CPS chamber until the check valve becomes a no way valve due to the pressure and the one wayness. You pull the trigger which opens a way in the nozzle for the water and pressure that is in the CPS chamber to leave.