Johnson Controls T-4000-2139 Cover Designed as a direct replacement

Designed as a direct replacement component for the A-4400 series refrigerated air dryer

critical for preventing heat exchanger fatigue and over-firing

preventing premature wear in high-cycle fluid control applications

This OEM Honeywell part functions by providing the necessary compression and alignment for the packing cartridges

Johnson Controls T-4000-2139 Cover Designed as a direct replacementThe Johnson Controls T 4000 2139 is a professional grade horizontal thermostat cover designed specifically for the T 4000 Series pneumatic room thermostats. Engineered for sleek, unobtrusive installation, this beige plastic cover features a clean aluminum faceplate without a thermometer window or setpoint adjustment openings. This configuration is ideal for facilities where unauthorized tampering must be minimized while maintaining a uniform aesthetic