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The Goodman B1392139 View Port Bushing is a genuine OEM grommet that seals and frames the combustion-chamber sight/view port on the AMEC800803BXAB gas furnace and related Goodman/Amana models. It lets a technician safely observe the burner flame during service while keeping the combustion chamber sealed against air leaks. A brittle or missing bushing can let in dilution air and make flame inspection difficult.
The OEM B1392139 is molded from heat-rated material sized to snap into the factory port opening for a snug, sealed fit. Generic grommets may be the wrong diameter or degrade near combustion heat, breaking the seal. At this price, genuine OEM is the obvious pick.
Rating: Easy (1/5). With power off, pop out the old bushing and press the new one into the view-port opening — under 5 minutes, no tools required. A simple DIY replacement.