2-inch outside diameter and 43

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

Optimized Compatibility: Suitable for natural gas

verify the specific material requirements for your application

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

Johnson Controls D-251-6003 Diaphragm 30067439-890 2-inch outside diameter and 43The 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