{"product_id":"oem-goodman-refrigerant-piston-metering-kit-for-anz130481ab-b1789878","title":"OEM Goodman Refrigerant Piston Metering Kit for ANZ130481AB — B1789878","description":"\u003ch2\u003eGoodman B1789878 Piston Kit\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1789878\u003c\/strong\u003e is a genuine OEM refrigerant piston (flowrator) metering kit for the \u003cstrong\u003eANZ130481AB\u003c\/strong\u003e heat pump. The piston is the fixed-orifice metering device that regulates refrigerant flow into the coil, setting the pressure drop that governs system capacity and efficiency. Using the correct piston bore is essential for proper superheat\/subcooling and rated performance — the wrong size directly hurts capacity and efficiency.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCategory: Metering device \/ fixed-orifice piston\u003c\/li\u003e\n\u003cli\u003eFunction: Refrigerant flow control at the coil\u003c\/li\u003e\n\u003cli\u003eType: Bullet-style flowrator piston kit\u003c\/li\u003e\n\u003cli\u003eFits: Goodman ANZ130481AB heat pump\u003c\/li\u003e\n\u003cli\u003ePart number: B1789878\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston performance is entirely defined by its precise bore diameter, matched by Goodman to this unit's tonnage and refrigerant. Generic pistons may be close but not exact, throwing off charge and pressures. Since the OEM part costs only a few dollars, there is no reason to gamble on an off-spec substitute.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIntermediate to Advanced (4\/5).\u003c\/strong\u003e The piston sits inside the liquid-line flare\/orifice housing, so replacement requires recovering refrigerant, opening the metering assembly, seating the new piston, then evacuating and recharging. A certified-technician repair.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058266259827,"sku":"GOODMAN-15194","price":7.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-refrigerant-piston-metering-kit-for-anz130481ab-b1789878","provider":"National HVAC Parts","version":"1.0","type":"link"}