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The Goodman B1392139 is a genuine OEM view port bushing used at the combustion sight/inspection port on the ACVC81005CXBC gas furnace and compatible Goodman and Amana models. This small grommet-style fitting seats the view port window and helps maintain the combustion chamber seal so technicians can safely observe the burner flame without compromising the enclosure.
Though inexpensive, this is a factory OEM part sized to the exact port diameter. A correct seal here matters for combustion integrity and flame observation. Generic grommets may not seat tightly or withstand the heat near the burner area, so OEM is the safe choice.
Easy (1/5). Press-fit into the view port opening — no tools or wiring required. Shut off power and let the unit cool before servicing. A quick under-5-minute replacement.