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The Goodman B1392139 view port bushing is a genuine OEM sealing grommet for the sight-glass/observation opening on the AMH80903BXCC 80% AFUE gas furnace. It holds the burner-viewing port in place and maintains a tight seal around the cabinet opening so combustion air pressures stay within spec and burner flames can be safely observed during service. A missing or degraded bushing can allow air leakage that affects pressure-switch operation.
OEM B1392139 is molded to the exact opening diameter so it snaps in and seals without gaps. Off-size generic grommets can fall out or leak. Given the very low cost, replacing with genuine OEM whenever it's cracked or brittle is a no-brainer.
Very easy (1/5). Simply press the old bushing out and snap the new one into the port opening by hand. No tools required. A quick, inexpensive fix that keeps the burner compartment properly sealed.