Lochinvar & A.O. Smith 100208569 Bulb Well a reading of "Open" or

a reading of "Open" or no beep indicates the fuse has tripped and must be replaced

For a veteran technician

Maintains system safety by preventing gas flow in the absence of a stable combustion flame

The color-coded red finish allows for immediate identification during inspection or maintenance

Use of sealant on the flare face is not recommended

Lochinvar & A.O. Smith 100208569 Bulb Well a reading of "Open" orInstall the Lochinvar & A. O. Smith 100208569 Bulb Well to ensure high precision thermal monitoring in hydronic heating systems. This 1 4 inch NPT HVAC temperature sensor well is a direct OEM replacement designed to house analytical probes for accurate aquastat or controller feedback. As a veteran grade boiler replacement part, it is functionally identical to the TST2044 and TST2044K legacy models. The 100208569 is engineered for Lochinvar Knight and