{"product_id":"oem-goodman-flow-check-piston-kit-for-gsc130484ba-b1789888","title":"OEM Goodman Flow Check Piston Kit for GSC130484BA — B1789888","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1789888 Flow Check Piston Kit\u003c\/strong\u003e is the OEM refrigerant metering device (fixed-orifice piston) sized for the \u003cstrong\u003eGSC130484BA\u003c\/strong\u003e 4-ton, 13 SEER air conditioner. The piston meters liquid refrigerant into the evaporator at the exact rate the system was designed for, which is critical to maintaining rated capacity, efficiency, and superheat.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Flow-check \/ fixed-orifice piston (metering device)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman GSC130484BA matched condenser\/coil systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Bi-flow refrigerant metering for heat-pump\/AC operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e B1789888\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston orifice diameter is matched to system tonnage to the thousandth of an inch. Installing a \u003cstrong\u003egenuine Goodman OEM piston\u003c\/strong\u003e guarantees the correct bore size; a generic or mismatched piston will throttle refrigerant incorrectly, causing poor cooling, frosting, or compressor stress. OEM is the safe choice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAdvanced (4\/5).\u003c\/strong\u003e Requires EPA Section 608 certification — recovering refrigerant, opening the liquid line at the piston housing, swapping the orifice, then evacuating and recharging the system. This is a job for a licensed HVAC technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Direct Replacement","offer_id":63032342610291,"sku":"B1789888-GEN","price":5.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048238170483,"sku":"B1789888","price":7.74,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-burner-orifice-B1789888_a1783bf1-1de9-4182-a316-43f6109921c6.jpg?v=1782948274","url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-flow-check-piston-kit-for-gsc130484ba-b1789888","provider":"National HVAC Parts","version":"1.0","type":"link"}