Johnson Controls T-4000-2140 Plastic Cover this component is critical for

this component is critical for restoring peak efficiency to your condenser fan and compressor circuits

straight-out wiring

this disc ensures high-efficiency combustion by regulating the secondary air intake at the burner rack manifold

Made in the USA kit is the professional standard for preventative maintenance and verifying successful system cleanup after acidic contamination treatment

Johnson Controls T-4000-2140 Plastic Cover this component is critical forThe Johnson Controls T 4000 2140 is a high durability beige plastic cover engineered specifically for horizontal mounted thermostats within the T 4000 series pneumatic control family. This rugged thermostat cover provides essential protection for bimetal sensing elements while maintaining a professional aesthetic with the integrated Johnson Controls logo. Designed for utility and precision, the faceplate features a high visibility F C thermometer for