While physical dimensions may match

ensuring a precise fit within the heat plenum where accurate sensing is vital

this high-temperature gasket prevents combustion gas bypass and air leakage

Classical Super Gripbelt engineered for high-demand HVACR and industrial motor applications

supporting multiple mounting configurations for faster service calls

Johnson Controls T-4000-2139 Cover While physical dimensions may matchThe 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