This is an authentic OEM sourced replacement piston driver assembly designed for a Hitachi nailer. It is the part of the nail gun that drives the nail into the material. Over time, especially continuously driving nails into extra hard material the piston may bend or get damaged otherwise requiring replacement. One piston assembly is included per order. Please note the o-ring for this piston is not included, it is sold separately. To complete this repair you will need a an allen wrench.
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