The Armstrong Furnace R43127-001 Flame Sensor is a critical OEM replacement part designed for precision flame rectification in residential heating systems

signaling that the 3/4" probe may require inspection or the system needs a water top-off

this unit utilizes 160P mineral oil and features a dual-cylinder design for balanced operation and long-term reliability in demanding commercial environments

This 6009 model is for the larger 1" and 1-1/2" castings

Industrial-Grade Durability: Constructed from corrosion-resistant materials to withstand the humidity and temperature fluctuations within an air handler

Lochinvar & A.O. Smith 100274781 Valve 320074-702 The Armstrong Furnace R43127-001 FlameThe Lochinvar and A. O. Smith 100274781 Pressure Relief Valve is a critical safety component designed for high efficiency commercial boilers and water heaters. Engineered to handle a set pressure of 125 PSI, this ASME Section IV certified valve prevents catastrophic system failure by relieving excess pressure during thermal expansion or control malfunctions. This specific model features a 3 4 inch NPT inlet and outlet, providing a high BTU discharge