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The Goodman B1392139 View Port Bushing is the genuine OEM grommet that seats the flame-observation (sight glass) port on the ACES960603BNAA gas furnace and matching Goodman/Amana 96% AFUE platforms. This small but critical fitting maintains the proper seal around the inspection window so the combustion chamber stays pressure-tight while still letting a technician verify burner ignition and flame quality.
Over years of heating cycles the original bushing can crack, harden, or fall out, allowing air leakage and a fogged or missing view port. Replacing it with the exact OEM part restores a clean factory seal and a clear line of sight to the burners.
Generic universal grommets are tempting on price, but they rarely match the exact bore and flange of the Goodman port, which leads to air leaks and rattles. The OEM B1392139 is molded to factory tolerances and rated for the temperatures near the combustion view port, giving you a guaranteed seal and long service life.
Easy (1/5) — Push-in replacement reachable from the furnace front panel; typically a 5-minute job with no tools. Always shut off power and gas before servicing.