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The Goodman B1392139 view port bushing is a genuine OEM part for the AMSS960402BNAA high-efficiency furnace and compatible Goodman/Amana models. This bushing frames and seals the burner observation (sight) port, allowing a technician to visually inspect the flame while keeping the combustion chamber sealed against air leaks. A cracked or missing bushing can disturb the combustion-air balance and pressure-switch reference, and lets flame-viewing light and heat escape improperly.
OEM vs. Generic: The factory bushing is molded from a heat-rated material sized to the exact view-port cutout on Goodman burner assemblies. Generic grommets may not tolerate the temperatures near the burner box or fit the opening, risking a poor seal right at the combustion chamber. The OEM part is the safe, correct choice for this location.
Install difficulty: Very Easy (1/5). With the furnace powered off, press the bushing into the view-port opening until it seats flush. No tools required. Inspect it during routine burner maintenance and replace if brittle, cracked, or loose.
A properly sealed view port supports correct draft and combustion on condensing furnaces. Confirm the part number against your unit before ordering.