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Install a new piston your Giant Pumps unloaders and regulators, such as the 22971C-01, 22971CR-01, 22973C-01, 22973CR-01, 22971-01, and 22974CR-01 models. Using General Pumps OEM parts like the 12206 piston is one of the best ways to extend the life of your regulator. Genuine General Pumps replacement part, guaranteed to fit. Use to replace damaged piston during maintenance or repairs.