This "E" series spring is specifically dimensioned for the 325-5 and 325-5A regulators

Safety Integrity: Acts as an essential fail-safe to cut power to the gas valve if airflow is restricted or temperatures exceed safe limits

This 100-250F auto limit switch features an automatic reset mechanism

providing a reliable failsafe against overheating

Armstrong Furnace R44992-001 Sensor Ignitor This "E" series spring isThe Armstrong Furnace R44992 001 Sensor Ignitor is a critical OEM replacement component designed for high efficiency gas furnaces. This dual purpose assembly functions as both a hot surface igniter and a flame sensor, ensuring precise ignition sequences and reliable flame rectification. Engineered for high temperature durability, the R44992 001 provides the resistance required for consistent heating cycles while maintaining the millivolt signal