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The Goodman B1392139 View Port Bushing is a genuine OEM sealing grommet for the AMVM970803BNBA variable-speed modulating gas furnace. It seats around the burner-compartment sight/view port, maintaining the sealed combustion envelope while still allowing the technician to observe flame and ignition. A missing or brittle bushing lets combustion air leak, which can cause pressure-switch faults, flame-sensing issues, and nuisance lockouts.
Because this bushing sits next to the sealed burner compartment, the OEM part is rated for the correct temperature and hole diameter. Generic grommets may not seal tightly or may degrade under heat, defeating the combustion seal. Choose OEM to keep the furnace running as designed.
Easy — press-fit into the view-port opening; no tools required. A quick 5-minute swap. Always shut off power and gas before opening the burner compartment.