The Johnson Controls T-4756-2141 Plastic Cover is a professional-grade replacement faceplate engineered specifically for the T-4000 Series Pneumatic Room Thermostats

but you should retain your existing mounting screw for the final installation

Universal Application: Compatible with a wide range of Lennox heating equipment

maintaining the static pressure integrity of the sealed combustion system

or a ruptured internal diaphragm within the switch itself

York S1-025-26366-006 Switch The Johnson Controls T-4756-2141 PlasticThe York S1 025 26366 006 Fan & Limit Switch is a mission critical component engineered for precise thermal regulation within York, Coleman, and Luxaire gas fired furnaces. This HVAC fan limit switch performs a dual function role: cycling the blower motor to optimize airflow and providing essential furnace high limit control to protect the heat exchanger from structural damage due to overheating. By utilizing a factory calibrated bimetal sensing