Precise High-Limit Protection: Prevents Outlet Temp Shutdown by providing accurate data for safety limit thresholds

This sensor provides continuous feedback on the damper's exact position to the building management system

Always verify the part number against the furnace wiring diagram or cabinet labels

Persistent trips typically indicate restricted airflow

Durable Construction: Built to withstand the high-temperature environment of the burner tray without warping or degrading

Johnson Controls D-251-6003 Diaphragm 30067439-890 Precise High-Limit Protection: Prevents OutletThe Johnson Controls D 251 6003 is a high performance replacement diaphragm specifically engineered for pneumatic actuator maintenance and repair. As a genuine Number 4 actuator part, this single piece diaphragm ensures a positive seal and consistent pressure response in critical HVAC and industrial machinery control systems. Designed for field service by veteran technicians, the D 251 6003 provides the necessary flexibility to regulate fluid or gas