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The Goodman B1392139 is a genuine OEM view port bushing designed to seat the sight glass on the burner compartment of the AMH80703AXCB gas furnace and other compatible Goodman and Amana 80% AFUE models. This small but critical fitting holds the flame-observation window securely in place, maintaining the sealed combustion enclosure so the inducer draws air correctly and combustion products vent safely. A cracked, brittle, or missing bushing can allow air leakage that disrupts the flame signal and triggers nuisance lockouts.
The genuine OEM B1392139 is molded to the exact diameter and heat rating required for the AMH80703AXCB burner enclosure, so it snaps in flush and seals on the first try. Generic look-alikes often use lower-temperature plastic that warps near the burners or fits loosely, letting air bypass the seal. For a part this inexpensive, the OEM piece is the reliable choice.
Easy (1/5). Power down the furnace, pop the old bushing out, press the new one in. No tools required. Always confirm the model number on your furnace rating plate before ordering.