{"product_id":"oem-goodman-view-port-bushing-for-gmpn120-5-furnace-b1392139","title":"OEM Goodman View Port Bushing for GMPN120-5 Furnace — B1392139","description":"\u003ch2\u003eGoodman B1392139 View Port Bushing\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1392139\u003c\/strong\u003e is a genuine OEM view port bushing engineered for the \u003cstrong\u003eGMPN120-5\u003c\/strong\u003e gas furnace. This small but essential rubber\/heat-resistant grommet seats the sight-glass window on the burner compartment, allowing safe visual inspection of the burner flame while sealing the opening against air leaks and heat escape. A cracked or missing bushing lets the sight glass rattle loose and can pull the burner box out of proper pressure balance — a direct replacement restores a clean, tight seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1392139\u003c\/li\u003e\n\u003cli\u003eType: View port \/ sight-glass bushing\u003c\/li\u003e\n\u003cli\u003eCompatibility: Goodman GMPN120-5 gas furnace\u003c\/li\u003e\n\u003cli\u003eFunction: Seals and mounts the burner-inspection window\u003c\/li\u003e\n\u003cli\u003eMaterial: Heat-resistant grommet\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis is the factory OEM Goodman part, molded to the exact bore and thickness of the original opening. Universal aftermarket grommets often sit loose or degrade quickly under sustained burner-box heat. The OEM bushing guarantees a leak-free fit the first time and matches Goodman's material rating.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (1\/5).\u003c\/strong\u003e Push-in replacement — no tools required. Power down the furnace, remove the old bushing, and seat the new one in the view-port opening. A typical replacement takes under two minutes.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058150457715,"sku":"GOODMAN-12110","price":7.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-view-port-bushing-for-gmpn120-5-furnace-b1392139","provider":"National HVAC Parts","version":"1.0","type":"link"}