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The Goodman B1392139 View Port Bushing is a genuine OEM component for the AMVC80603BXCA variable-speed gas furnace. This bushing seats in the burner-compartment view port (sight glass) opening, holding the clear observation window in place while sealing the combustion-air boundary so the furnace maintains the correct sealed-combustion pressure a technician needs to see the burner flame safely.
Though a low-cost part, the OEM B1392139 is sized to the exact port diameter for a snug, air-tight fit. A loose or generic bushing can allow a combustion-air leak that affects pressure-switch operation. Given the minimal price, OEM is the clear choice.
Fully tool-free in most cases. Cut power, pop the old bushing and window out of the port, seat the new bushing, and press the sight glass back in. A quick under-10-minute replacement, ideal to do alongside any burner-compartment service.