Superior Parts SP 886-448 Aftermarket Piston Driver for Hitachi N5021A

Superior Parts SP 886-448 Aftermarket Piston Driver for Hitachi N5021A. This is a generic replacement driver without o-ring for the Hitachi N5021A. This comes with a patent pending locking mechanism which will not allow the driver to unscrew from the piston. Aluminum is crimped into the unilok grooves of the shaft to prevent unscrewing. Guaranteed never to unscrew.