Johnson Controls T-4000-2139 Beige Plastic Blank Cover Horizontal

The Johnson Controls T-4000-2139 is a beige plastic blank cover that is mounted horizontally. It is specifically manufactured to be used with pneumatic thermostats which are types of HVAC systems where control is by way of air pressure. This cover protects the underlying pneumatic thermostat from dust, dirt, and minor impacts while ensuring it is functional and visually appealing. Because it is a blank cover it conceals the inner workings of the thermostat and provides a neat and uniform appearance especially where appearance matters.