Piston Bumper

This replacement piston bumper is designed for use on Hitachi nailers. It is a genuine manufacturer sourced part. The purpose of this piston bumper is to keep the piston from hitting the bottom of the cylinder. If the bumper is cracked or missing pieces you can seriously damage the cylinder. Because this part get so much abuse it has a tendency to crack and fall apart. If you see and parts of this bumper falling from your nail gun, it is definitely time to replace it. This includes one (1) plastic piston bumper.