{"product_id":"oem-goodman-piston-kit-for-gsc130421ba-b1789884-1","title":"OEM Goodman Piston Kit for GSC130421BA — B1789884","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789884\u003c\/strong\u003e is a genuine OEM piston (fixed-orifice metering device) kit for the \u003cstrong\u003eGSC130421BA\u003c\/strong\u003e 13 SEER, 3.5-ton air conditioning system. The piston meters refrigerant flow into the evaporator coil, and its precisely sized orifice is matched to the unit's tonnage and coil to maintain correct superheat and system performance. Using the wrong orifice size starves or floods the coil and kills efficiency.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1789884\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Fixed-orifice piston \/ metering device kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Model:\u003c\/strong\u003e GSC130421BA (3.5-ton \/ 13 SEER)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Refrigerant flow control to evaporator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman (OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003egenuine Goodman OEM piston\u003c\/strong\u003e is drilled to the exact orifice diameter engineered for this system's capacity. Generic pistons may be close but not identical in bore size, throwing off the refrigerant charge and superheat. The OEM kit ensures factory-rated cooling capacity and efficiency.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAdvanced.\u003c\/strong\u003e Replacing the piston requires recovering the refrigerant, opening the sealed refrigerant circuit, swapping the orifice, evacuating the lines, and recharging — all EPA Section 608 certified work. This must be performed by a licensed HVAC technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057194516851,"sku":"GOODMAN-709","price":10.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-gsc130421ba-b1789884-1","provider":"National HVAC Parts","version":"1.0","type":"link"}