{"product_id":"oem-goodman-piston-restrictor-kit-for-anz130481ac-b1789878","title":"OEM Goodman Piston \/ Restrictor Kit for ANZ130481AC — B1789878","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1789878\u003c\/strong\u003e is a genuine OEM piston (flow restrictor \/ metering device) kit for the \u003cstrong\u003eANZ130481AC\u003c\/strong\u003e heat pump. The piston meters refrigerant flow into the evaporator or condenser coil, maintaining the correct pressure drop and superheat for efficient heat transfer. A worn, clogged, or incorrectly sized piston causes poor cooling and heating performance, coil frosting, and higher energy bills — so using the factory-specified orifice size matters.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789878\u003c\/li\u003e\n\u003cli\u003eComponent Type: Piston \/ Fixed Orifice Metering Device\u003c\/li\u003e\n\u003cli\u003eFunction: Meters refrigerant flow at the coil\u003c\/li\u003e\n\u003cli\u003eEquipment: Heat Pump Condensing Unit\u003c\/li\u003e\n\u003cli\u003eFits Model: ANZ130481AC\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman (Amana ANZ series)\u003c\/li\u003e\n\u003cli\u003eIncludes: Precision-drilled piston insert\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston bore diameter is matched to the ANZ130481AC's tonnage and refrigerant charge. This OEM kit carries the exact factory orifice size, guaranteeing correct refrigerant metering. Generic pistons are sold in assorted bores and, if mismatched, will throw off superheat\/subcooling and rob the system of capacity. For a metering device, correct sizing is everything — OEM removes the guesswork.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eRating: Hard (Professional Required).\u003c\/strong\u003e The piston sits inside the liquid-line flare connection at the coil, so replacement requires refrigerant recovery, opening the sealed system, swapping the insert, then evacuating and recharging. An EPA-certified technician should perform this work to protect the charge and warranty.\u003c\/p\u003e\u003cp\u003eCompatible with the Goodman\/Amana ANZ130481AC heat pump. Verify your model and serial before ordering.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058266390899,"sku":"GOODMAN-15199","price":7.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-restrictor-kit-for-anz130481ac-b1789878","provider":"National HVAC Parts","version":"1.0","type":"link"}