they are interchangeable part numbers for the same Genuine Lennox sensor

Measuring 5/16" diameter by 36" length

and heavy-duty relay logic setups

requiring standard brazing techniques for installation

this plunger assembly is built to withstand the rigorous duty cycles of industrial HVACR systems where precise linear modulation is required

Lochinvar & A.O. Smith 100135290 Burner Assembly 30067439-890 they are interchangeable part numbersThe Lochinvar and A. O. Smith 100135290 Burner Assembly is a direct OEM replacement engineered for high efficiency commercial water heaters and boilers. This assembly, cross referenced as BNR3400, features an integrated pressure tap for precise manifold pressure adjustments and diagnostic testing. Designed for optimized gas air mixing, this replacement burner assembly ensures stable flame patterns and consistent thermal output in demanding hydronic