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The Goodman B1392139 is a genuine OEM view port bushing for the ADSS800403AXAD furnace and compatible Goodman/Amana models. This small but important fitting seats in the burner observation (sight) port, holding the sight glass in place and maintaining a proper seal so the combustion chamber stays enclosed. A cracked or missing bushing can allow air infiltration around the port and make flame observation unreliable.
The OEM B1392139 is molded from heat-tolerant material sized precisely to the Goodman port opening, so it snaps in and holds the sight glass securely. Generic grommets frequently run undersized or use materials not rated for the temperatures near the burner box. At this price, genuine OEM is the obvious choice.
Very Easy (1/5). Press-fit by hand into the observation port — no tools required. Confirm the sight glass reseats cleanly after installation.