O Ring N210233

This is an authentic manufacturer sourced replacement part designed for use with DeWALT and Black and Decker rotary demolition hammers. It helps to provide an air-tight seal for the cap, please make sure to refer to the appropriate diagrams of your model for the correct location and use of this hardware. It is made of high-quality rubber and it is sold individually, over time the material may wear out and crack eventually requiring replacement.