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The Goodman B1392139 View Port Bushing is the genuine OEM grommet that frames and seals the sight-glass viewing port on the AMVC80905CXAA gas furnace. It lets technicians safely observe the burner flame during operation while maintaining a proper seal around the opening in the burner compartment panel.
Because this bushing sits near the burner box, it is rated for the elevated temperatures found there. Generic grommets of the wrong diameter or material can shrink, crack, or fall out, leaving an unsealed gap. This OEM part drops into the factory opening with the correct press fit, preserving the compartment seal.
Easy (1/5). A quick press-fit replacement — remove the old bushing and snap the new one into the panel opening. Disconnect power before opening the furnace. No tools typically required.