Johnson Controls Filter Cartridge A-4000-604

Johnson Controls A‑4000‑604 is a replacement filter cartridge designed for use in Johnson Controls A‑4000 series pneumatic air line filters. This cartridge removes moisture, oil vapor, and particulate contaminants from compressed air used in pneumatic HVAC control systems. By maintaining clean, dry air, the A‑4000‑604 helps ensure accurate signal transmission, stable actuator performance, and long‑term reliability of pneumatic thermostats, controllers, and damper/valve actuators.