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The Goodman B1392139 View Port Bushing is a genuine OEM replacement for the Goodman WFD18115S5CXCB furnace and compatible models. This small bushing seats the sight-glass viewing port on the burner compartment, keeping the seal tight so you can safely observe flame condition without combustion air leaks or rattle. A cracked or missing bushing is a quick, inexpensive fix.
The OEM B1392139 is molded to the exact port diameter of your furnace cabinet, so it snaps in flush and holds the view lens without gaps. Generic grommets rarely match the bore precisely and can back out or fail to seal, allowing combustion-air disturbance. For a part this affordable, the factory fit is worth it.
Very Easy — 1 out of 5. This is a tool-free, press-in replacement that takes under five minutes. Power down the furnace, pop the old bushing out, and seat the new one in the cabinet port. No calibration or gas work required.
Stock a few as inexpensive spares. Questions? Contact info@nationalhvacparts.com.