{"product_id":"oem-goodman-furnace-piston-orifice-kit-for-gmpn080-4-b1789882","title":"OEM Goodman Furnace Piston Orifice Kit for GMPN080-4 — B1789882","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789882 Piston Kit\u003c\/strong\u003e is a genuine OEM set of metering restrictors (orifices) engineered for \u003cstrong\u003eGMPN080-4\u003c\/strong\u003e gas furnaces. Precisely sized pistons control the gas flow rate to each burner, ensuring a clean, correctly proportioned flame and rated BTU output. Using the factory-specified piston is essential for safe combustion and efficient heating.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1789882\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Piston \/ orifice metering kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Machined brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman GMPN080-4 furnaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Meter gas flow for proper burner input and flame\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eOrifice sizing is a precision matter — even a few thousandths of an inch changes the gas input and flame characteristics. The genuine B1789882 is drilled to Goodman's exact specification for the GMPN080-4, so you get the correct BTU rate out of the box. Generic pistons may be mislabeled or inconsistently bored, risking over- or under-firing, sooting, or a lifted flame. Stick with OEM for a safe, code-compliant result.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2 of 3).\u003c\/strong\u003e Replacing pistons requires shutting off the gas, disconnecting the burner\/manifold assembly, and swapping the orifices — work best performed by an HVAC technician who can verify manifold pressure and flame after reassembly. Always leak-check every joint before returning the furnace to service.\u003c\/p\u003e\u003cp\u003eOrder the authentic Goodman B1789882 piston kit to restore proper gas metering and a clean burner flame in your GMPN080-4 furnace.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058145018227,"sku":"GOODMAN-12082","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-furnace-piston-orifice-kit-for-gmpn080-4-b1789882","provider":"National HVAC Parts","version":"1.0","type":"link"}