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The B1392139 is a genuine OEM view-port bushing (sight-glass grommet) for the Goodman/Amana AMVC80805CNCA gas furnace. This small but essential component seals the burner-compartment inspection window, letting a technician safely observe the flame while keeping combustion gases and heat contained. Over time the original bushing can harden, crack, or discolor, obscuring the view port and compromising the seal — a fresh OEM bushing restores a clear, safe inspection window.
Genuine Goodman bushings are molded from high-temp material rated for the burner compartment and sized to the exact port diameter. Generic substitutes may not tolerate sustained heat and can shrink or deform, breaking the seal. Given the low cost of this part, OEM is the clear value.
Easy (1/5). Power down the furnace, remove the burner-compartment cover, press out the old bushing, and seat the new one. Typically under 15 minutes with no special tools.