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The Goodman B1392139 View Port Bushing is the genuine OEM grommet that frames the burner-flame sight window on the ACSS920603BNAA furnace. It seals the inspection opening on the burner box so technicians can verify flame quality without allowing air leakage that would disturb combustion or pressure-switch operation. A cracked or missing bushing can cause a small air leak and an out-of-spec burner box.
This bushing is sized to the exact sheet-metal cutout on the Goodman burner panel, so it snaps in flush and seals. There is effectively no reliable generic equivalent at the correct diameter and temperature rating — the OEM part is the correct repair.
Very Easy (1/5). Press the old bushing out and snap the new one into the view-port opening by hand. Under 2 minutes.