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The Goodman B1392139 is a genuine OEM view port bushing for the GDH80403ANBA gas furnace. This small but important fitting mounts in the burner-compartment sight/observation port, providing a clean, sealed grommet through which a technician can safely view the burner flame and flame pattern. A cracked, missing, or deteriorated bushing can allow air leakage around the port and make flame inspection difficult.
The OEM Goodman bushing is molded to the exact port diameter and heat rating of the burner compartment. Off-the-shelf grommets may not fit the opening precisely or withstand sustained heat, leading to a loose or degraded seal. For a low-cost part in a high-heat location, the OEM piece is the reliable choice.
Very Easy (1 of 3). This is a snap-in replacement that takes just a few minutes. With power off, remove the old bushing from the observation port, clean the opening, and press the new bushing firmly into place until it seats evenly. No tools are typically required.