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The Goodman B1392139 View Port Bushing is a genuine OEM component designed for the AMVM970603BNBA modulating gas furnace and other compatible Goodman, Amana, and Daikin models. This rubber grommet-style bushing seats the sight glass / view port in the burner compartment door, sealing the opening so you can safely observe flame ignition and burner operation without air leakage that could disrupt combustion or pressure-switch readings.
This is the factory OEM part, molded to the exact bore diameter and thickness the door cutout requires. Generic universal grommets often fit loosely, allowing air infiltration that skews pressure-switch and flame-sensing behavior. Choosing the OEM B1392139 guarantees a tight, code-correct seal and long service life.
Easy — DIY friendly (1/5). No tools required; the bushing presses into the door opening by hand in under a minute. Always shut off gas and power before opening the furnace cabinet.