{"product_id":"oem-goodman-view-port-bushing-for-gsm100-4-furnace-b1392139","title":"OEM Goodman View Port Bushing for GSM100-4 Furnace — B1392139","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1392139 View Port Bushing\u003c\/strong\u003e is a genuine OEM sealing grommet for the flame-inspection sight port on \u003cstrong\u003eGSM100-4\u003c\/strong\u003e gas furnaces and compatible Goodman\/Amana models. This small but essential fitting holds the view-port glass in place and creates an airtight seal, letting a technician watch the burner flame during startup without allowing flue gases or combustion air to leak from the vestibule panel.\u003c\/p\u003e\u003cp\u003eOver years of heat cycling the original bushing can harden, crack, or fall out, which shows up as nuisance flame-sensor faults, pressure-switch trips, or a whistling draft around the inspection window. Replacing it with the correct OEM part restores a proper combustion seal.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart type:\u003c\/strong\u003e View port \/ sight-glass bushing (grommet)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-temperature molded rubber\/silicone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman GSM100-4 and compatible Goodman \u0026amp; Amana furnaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Seals and retains the burner-observation port glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part #:\u003c\/strong\u003e B1392139\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM vs. Generic:\u003c\/strong\u003e The OEM bushing is molded to the exact port diameter and rated for the vestibule temperatures Goodman specifies, so it seats fully and holds its seal. Generic grommets are cheaper but frequently oversize or under-rated, leading to a loose fit or premature hardening. For a reliable combustion seal we recommend the OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstall difficulty:\u003c\/strong\u003e Easy (1\/5). Cut power and gas, pop out the old bushing, press the new one into the port, and reinstall the glass. Typically a 5-minute job with no tools required.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058181194099,"sku":"GOODMAN-B1392139","price":4.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-view-port-bushing-for-gsm100-4-furnace-b1392139","provider":"National HVAC Parts","version":"1.0","type":"link"}