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The Goodman B1392139 is a genuine OEM view-port bushing/grommet for the ACEC800603BXAA package unit. This small fitting lines the inspection or sight port, providing a clean, sealed pass-through that protects the cabinet opening and helps maintain proper airflow and combustion-area integrity. Though inexpensive, a missing or degraded bushing can allow air leakage and contamination at the port.
The OEM B1392139 is molded to the exact port diameter, so it snaps in and seals without modification. Generic grommets may be loose or oversized, defeating the seal. At this low price point, the genuine OEM part is the obvious choice.
A simple press-in replacement, typically done in under 10 minutes. Power down the unit, remove the old bushing, clean the opening, and seat the new bushing fully. Suitable for any HVAC technician.