The HammerHead CCR radial scrubber provides easy work of breathing and high flood tolerances. Manufactured from delrin and stainless steel, this is the most durable scrubber on the market today Spring loaded lid to combat channeling do to sorb settling Please choose the correct scrubber / space combo for your can. Available in the traditional threaded locking nut, or the revolutionary bayonet style lid. WARNING: Using the incorrect scrubber / spacer combination will lead to scrubber bypass which may result in serious injury or death. If you have an old HammerHead 'gen 1 can' (longer, and no engraved logo), then you need to call for assistance in choosing the correct combination.