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The Goodman B1392139 View Port Bushing is a genuine OEM sight-glass grommet used on the AMVC81005CXBC two-stage variable-speed gas furnace. It seals the inspection port in the burner compartment door so a technician can observe the flame during operation while keeping combustion air and flue gases properly contained. A cracked, missing, or hardened bushing lets ambient air leak into the sealed combustion path, which can trip the pressure switch or cause nuisance lockouts.
This is the factory OEM Goodman component, molded to the exact port diameter and temperature rating specified for the AMVC8 cabinet. Generic grommets are often close but not exact, leading to loose fit, air leaks, or premature heat cracking near the burner box. For a sealed-combustion furnace, an exact seal matters — we recommend OEM.
Easy (1/5). Power down the furnace, remove the old bushing from the view port opening, and press the new one into place. No tools or special skills required — most homeowners can complete this in under five minutes. As always, restore power and verify normal flame observation through the port afterward.
Backed by genuine Goodman quality and fast shipping. If you're unsure this bushing fits your unit, contact us at info@nationalhvacparts.com with your model and serial number.