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The Goodman B1392139 View Port Bushing is a genuine OEM component designed for the Amana/Goodman AMES960403ANAA gas furnace. This bushing seats the flame-observation sight glass in the combustion door, sealing the viewing port so you can safely inspect the burner flame while keeping the sealed combustion chamber airtight. A cracked or missing bushing lets combustion air leak and can trip pressure-switch faults, so replacing it with the correct OEM part restores proper furnace operation.
OEM vs. Generic: This is a factory Goodman B1392139 part, molded to the exact port diameter and rated for combustion-chamber temperatures. Aftermarket grommets are often the wrong durometer or bore size and may not seal, leading to nuisance lockouts. For a small furnace part like this, the OEM piece is the safe, correct choice.
Install Difficulty: Easy (DIY-friendly). Power down the furnace, remove the old bushing from the combustion door, and press the new B1392139 into place. No tools or special skills required — typically a 5-minute job.
Always disconnect power and gas before servicing. If you are unsure, consult a licensed HVAC technician.