{"product_id":"oem-goodman-43-natural-gas-burner-orifice-gsms100-4-b4089343","title":"OEM Goodman #43 Natural Gas Burner Orifice GSMS100-4 — B4089343","description":"\u003ch2\u003eGoodman B4089343 Burner Orifice (#43 Drill)\u003c\/h2\u003e\u003cp\u003eThe genuine OEM Goodman B4089343 is a #43 natural gas burner orifice (spud) for the Goodman GSMS100-4 gas furnace and compatible Goodman\/Amana models. Threaded into the manifold, this precision-drilled brass orifice meters the exact volume of gas delivered to each burner. The #43 drill size is matched to the furnace's BTU input and supply-gas type, making correct orifice sizing essential for proper flame characteristics, clean combustion, and safe, efficient operation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDrill size: #43 orifice\u003c\/li\u003e\n\u003cli\u003eFuel type: Natural gas\u003c\/li\u003e\n\u003cli\u003eFunction: Meters gas flow to the burner\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GSMS100-4 and compatible furnaces\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: B4089343\u003c\/li\u003e\n\u003cli\u003eMaterial: Machined brass\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe genuine Goodman B4089343 is drilled and threaded to the precise factory specification, so BTU input and flame quality remain within design tolerance. An incorrectly sized or off-spec generic orifice can cause under- or over-firing, sooting, or unsafe combustion. For a gas-metering component, the OEM orifice is the safe choice — always verify the correct drill size for your fuel type and altitude.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2\/5).\u003c\/strong\u003e Shut off gas and power, remove the burner or manifold as needed, unthread the old spud with a properly sized socket, and install the new orifice — avoiding cross-threading or over-torque. About 20–30 minutes; leak-test all connections after reassembly.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058182046067,"sku":"GOODMAN-12984","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-43-natural-gas-burner-orifice-gsms100-4-b4089343","provider":"National HVAC Parts","version":"1.0","type":"link"}