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The Goodman B1392139 View Port Bushing is the genuine OEM grommet that frames the flame-observation sight opening on the AMVM971205DNBA modulating gas furnace. It protects the cabinet edge around the view port and helps maintain a proper seal so combustion can be safely inspected without cabinet air leakage.
The OEM bushing is sized to the furnace's exact view-port cutout and rated for the elevated temperatures near the burner box. Off-brand rubber grommets can shrink, crack, or fall out under heat — the factory part is the reliable choice.
Very Easy (1/5) — Snaps into the view-port opening by hand. No tools required. Under 2 minutes.