The Bendix Worm Gear, part number 233919N, is an air brake automatic slack adjuster component used in heavy-duty truck brake systems. This worm gear is the correct replacement part for slack adjuster assemblies that rely on this specific internal gear to maintain proper brake adjustment. If you need to verify compatibility with your specific slack adjuster model or vehicle application, Pro Gear and Transmission can help – give us a call before ordering to confirm this is the right part for your setup.Interchanges:BW233919NA factory handling fee of $20.00 per unit is added at checkout.FeaturesBendix part number 233919NDesigned for air brake automatic slack adjuster assembliesSold individually as a single unit replacement componentGenuine Bendix brake hardwareCall Pro Gear and Transmission to confirm fitment with your specific slack adjuster model