and Nordyne gas furnace units

Key Benefits: Forged Brass Construction: High copper content (65%) prevents fatigue and failure compared to cast alternatives

The Bradford White 415-43676-03 Thermal Switch is a critical safety component designed for atmospheric vent gas water heaters and Defender Safety System models

If the link is open (infinite resistance)

and Miller gas-fired furnaces and packaged units

Honeywell 301572A/0767 Thermostat Key and Nordyne gas furnace unitsThe Honeywell 301572A 0767 Thermostat Key is an essential field tool designed for facility managers and HVAC contractors maintaining building security. This replacement thermostat key provides authorized access to locked thermostat covers, preventing unauthorized setpoint adjustments and tampering in commercial environments. Engineered for durability, this key is the direct replacement for standard Honeywell locking covers and is technically identical