{"product_id":"oem-goodman-flow-check-piston-kit-for-gsc130484bb-b1789888-1","title":"OEM Goodman Flow Check Piston Kit for GSC130484BB — B1789888","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789888\u003c\/strong\u003e is a genuine OEM flow check piston (fixed-orifice metering device) kit for the \u003cstrong\u003eGSC130484BB\u003c\/strong\u003e 4-ton, 13 SEER air conditioner. The piston meters refrigerant flow into the evaporator coil, allowing flow in one direction and restricting it in the other. Correct orifice sizing is critical to system capacity and efficiency — an incorrect or worn piston causes poor cooling, high head pressure, or coil flooding.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Flow check piston \/ fixed-orifice metering device\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman GSC130484BB and matched coil systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Meters refrigerant to the indoor coil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Piston and seal hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1789888\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM vs. Generic:\u003c\/strong\u003e The genuine Goodman piston is bored to the precise orifice diameter engineered for this tonnage and refrigerant charge. Generic pistons may be close but not exact, and even a small orifice mismatch shifts superheat\/subcooling out of spec. Always match OEM sizing for proper system charge and performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstall difficulty:\u003c\/strong\u003e Moderate to advanced. Replacement requires recovering refrigerant, opening the sealed refrigerant system, and re-evacuating\/recharging — EPA 608 certification and proper tools are required. Professional installation is strongly recommended.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057201627507,"sku":"GOODMAN-798","price":10.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-flow-check-piston-kit-for-gsc130484bb-b1789888-1","provider":"National HVAC Parts","version":"1.0","type":"link"}