Model 4 Air dryers

Model 4 air dryer components designed to maintain moisture control in legacy heavy-duty air brake systems. This lineup includes desiccant cartridges, purge valve kits, heater kits, pressure relief valves, end cover rebuild kits, and mounting hardware required to service and restore AD-4 and equivalent dryer platforms. Model 9 air dryers replace and improve on the older Model 4 design, delivering stronger moisture removal and longer service intervals for commercial truck brake systems. These components support continued operation of Model 4 systems where still in service, ensuring proper moisture removal, pressure regulation, and reliable braking performance.
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