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When installed correctly
While it features the standard tapped port for a thermocouple or thermopile connection
Precision-engineered OEM Lennox part ensuring exact 1-7/8 inch shaft sizing for compatible blower wheels
this specific model (TX2) is internally equalized
Lochinvar & A.O. Smith 100233609 Gasket 323080-701 When installed correctlyThe Lochinvar & A. O. Smith 100233609 Gasket Flapper Valve is a critical OEM replacement component engineered for high efficiency condensing boilers and commercial water heaters, including the Lochinvar Armor X2 and Shield SN126 401 series. As a veteran grade HVAC flapper valve, this part serves as a directional check mechanism within the combustion or venting assembly, preventing hazardous exhaust gas backflow and maintaining proper pressurized seal
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