The piston assembly is the critical internal component that manages pressure regulation within your HPA tank system. This complete assembly maintains consistent air delivery by controlling the flow of high-pressure air from the tank to your paintball marker. Engineered for Protoyz tanks, it ensures reliable performance and stable velocity consistency during play. Precision-manufactured to exacting tolerances, this replacement part restores your regulator to factory specifications when wear or damage occurs. Essential maintenance component for serious players who demand dependable air regulation.