Lochinvar & A.O. Smith 100163259 Sight Glass Kit 323613-751 Built with heavy-duty bearings and

Built with heavy-duty bearings and a standard NEMA frame mounting pattern

Key Benefits: Fail-Safe Protection: The LF24 mechanical spring return ensures the valve returns to its programmed safety position during power loss

maintaining the HVAC airflow optimization required for efficient heat exchange

The assembly is designed for spring return stem up action

Direct OEM Compatibility: Engineered to replace 331-09118-000 and 50A51-243 without requiring modification to the mounting footprint or harness

Lochinvar & A.O. Smith 100163259 Sight Glass Kit 323613-751 Built with heavy-duty bearings andThe Lochinvar & A. O. Smith 100163259 Sight Glass Kit is a critical OEM replacement part designed for high performance visual monitoring in Lochinvar Knight and A. O. Smith residential and commercial boilers. Engineered for high pressure HVACR environments, this kit allows technicians to verify flame ignition and combustion stability without compromising the integrity of the heat exchanger seal. As a direct replacement for obsolete part numbers