{"product_id":"oem-goodman-sight-view-port-bushing-grommet-for-gsu100-4-b1392139","title":"OEM Goodman Sight\/View Port Bushing Grommet for GSU100-4 — B1392139","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1392139 View Port Bushing\u003c\/strong\u003e is the grommet\/insert that seals the sight (observation) port on the furnace vestibule panel, letting a technician view the burner flame while keeping the combustion area properly closed. This small but essential part is a direct-fit replacement for the \u003cstrong\u003eGoodman GSU100-4\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: View\/sight port bushing (grommet insert)\u003c\/li\u003e\n\u003cli\u003eMaterial: Heat-resistant molded bushing\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GSU100-4 furnace observation port\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: B1392139\u003c\/li\u003e\n\u003cli\u003eFunction: Seals the burner sight-glass opening\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis is an exact-fit molded part with almost no aftermarket equivalent. The \u003cstrong\u003egenuine Goodman OEM bushing\u003c\/strong\u003e matches the port diameter of the GSU100-4 vestibule panel, so it seats snugly and maintains the intended seal. Given the very low cost, OEM is the clear choice over an improvised substitute.\u003c\/p\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDifficulty: Very Easy (DIY-friendly).\u003c\/strong\u003e No tools required in most cases — simply press the old bushing out of the panel opening and snap the new one into place. Ensure it seats fully around its groove so the port stays sealed. A missing or cracked bushing can allow air leakage and should be replaced promptly.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058182930803,"sku":"GOODMAN-13019","price":0.85,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-sight-view-port-bushing-grommet-for-gsu100-4-b1392139","provider":"National HVAC Parts","version":"1.0","type":"link"}