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The genuine Goodman B1392139 View Port Bushing is the OEM sight-glass grommet used on the AMH81405DNAC 80% AFUE gas furnace and other Goodman/Amana single-stage models. This small rubber/plastic bushing seals the observation port on the burner compartment, letting you safely watch flame ignition and rollout without compromising the cabinet's air seal. A cracked, brittle, or missing bushing is a common cause of nuisance flame-signal and pressure-related lockouts.
The OEM B1392139 is molded to the exact port diameter for a snap-tight, leak-free seal and is rated for the burner compartment's operating temperatures. Aftermarket generic grommets are lower cost but often loosen or deform under heat, leading to air leaks and repeat service calls. For a $7 part sealing a combustion cabinet, OEM is the smart choice.
Press-fit replacement — no tools beyond removing the burner-compartment door. Power down the furnace at the disconnect before servicing. Roughly a 5-minute job for most homeowners.