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The B1392139 is the genuine OEM view port bushing (sight-glass grommet) for the Amana/Goodman AMVC800603BNAA gas furnace. It seats in the burner/inspection port and provides a clean, heat-tolerant pass-through so you can safely observe flame color and ignition through the viewing window. A missing or degraded bushing lets combustion air leak and can obscure the sight port, making flame inspection and diagnostics harder.
Genuine OEM guarantees the correct outside diameter and depth to snap securely into the factory port. Off-the-shelf grommets are rarely rated for the temperatures near the burner compartment and can shrink, harden, or fall out. For safety and a lasting seal, use the OEM bushing.
Rating: Very Easy (1/5). No special tools required — press the old bushing out and the new one in by hand with power disconnected. Under 5 minutes.
An inexpensive but important part for keeping your flame-inspection port sealed and clear. Confirm your model before ordering.