{"product_id":"oem-goodman-refrigerant-piston-kit-for-anz130481aa-b1789878","title":"OEM Goodman Refrigerant Piston Kit for ANZ130481AA — B1789878","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789878 Refrigerant Piston Kit\u003c\/strong\u003e is the genuine OEM metering device (flowrator) that controls refrigerant flow into the coil on the \u003cstrong\u003eANZ130481AA\u003c\/strong\u003e heat pump. This precision-drilled piston sets the exact orifice size the system needs to maintain proper superheat and subcooling, ensuring rated capacity and efficiency. Using the wrong piston size — or a worn, debris-clogged one — causes poor cooling, iced coils, high head pressure, and compressor stress.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789878\u003c\/li\u003e\n\u003cli\u003eType: Fixed-orifice refrigerant piston (flowrator) kit\u003c\/li\u003e\n\u003cli\u003eFunction: Meters liquid refrigerant into the coil\u003c\/li\u003e\n\u003cli\u003ePrecision-machined orifice matched to system tonnage\u003c\/li\u003e\n\u003cli\u003eFits: Goodman\/Amana ANZ130481AA and compatible heat pumps\u003c\/li\u003e\n\u003cli\u003eKit includes piston and retainer\/seal components as supplied by the factory\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003egenuine OEM Goodman\u003c\/strong\u003e piston is bored to the precise diameter this coil and compressor were rated for. Even a few thousandths of an inch off — common with generic pistons — throws off the charge and can slash efficiency or damage the compressor. At this price point, there is no reason to gamble on a non-OEM orifice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAdvanced (4\/5).\u003c\/strong\u003e Swapping the piston requires refrigerant recovery, opening the liquid-line\/coil connection, seating the new piston with the correct orientation, then evacuating and recharging — a job for an EPA-certified technician. Professional installation recommended.\u003c\/p\u003e\u003cp\u003eGenuine Goodman metering accuracy. Share your model and serial and we'll confirm the correct piston size.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058266161523,"sku":"GOODMAN-15189","price":7.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-refrigerant-piston-kit-for-anz130481aa-b1789878","provider":"National HVAC Parts","version":"1.0","type":"link"}