including the FM1D14 and FM1D20

you must use a T&P valve certified under ASME Section XL or ANSI Z21

ensuring consistent performance in any mounting position

Critical for LP gas conversion kits and maintaining furnace efficiency

preventing issues like incomplete combustion or burner soot buildup

Lochinvar & A.O. Smith 100233264 Bulbwell including the FM1D14 and FM1D20The Lochinvar 100233264 Bulbwell is a precision engineered immersion well designed for accurate temperature sensing in commercial boilers and water heaters. As a direct OEM replacement part, this component ensures the aquastat sensor or thermostat bulb is properly isolated from the high pressure system fluid while maintaining optimal thermal conductivity. This specific model is functionally identical to Lochinvar TST2301 and TST2301K, providing a