{"product_id":"oem-goodman-metering-piston-kit-for-asz130181af-heat-pump-b1789851","title":"OEM Goodman Metering Piston Kit for ASZ130181AF Heat Pump — B1789851","description":"\u003ch2\u003eGenuine Goodman Metering Piston Kit — B1789851\u003c\/h2\u003e\u003cp\u003eThe Goodman B1789851 metering piston (flow-rator) is the fixed-orifice refrigerant metering device used in the \u003cstrong\u003eASZ130181AF\u003c\/strong\u003e 1.5-ton heat pump system. It regulates the flow of liquid refrigerant into the coil, controlling superheat and subcooling for correct capacity and efficiency. A worn, clogged, or incorrectly sized piston causes poor cooling, iced coils, and high energy bills. This OEM kit ensures the exact orifice bore your system was engineered for.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789851\u003c\/li\u003e\n\u003cli\u003eComponent: Fixed-orifice metering piston \/ flow-rator\u003c\/li\u003e\n\u003cli\u003eFits: Goodman ASZ130181AF heat pump (1.5 ton \/ 18,000 BTU \/ 13 SEER)\u003c\/li\u003e\n\u003cli\u003eFunction: Meters liquid refrigerant flow into the evaporator\/condenser coil\u003c\/li\u003e\n\u003cli\u003eKit includes: Precision-drilled piston insert\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston performance depends entirely on precise orifice diameter matched to system tonnage. The genuine Goodman piston is bored to factory tolerance for the ASZ130181AF; generic pistons with the wrong bore will mis-charge the system and hurt efficiency. At this low price, always use the OEM-specified orifice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eProfessional (4\/5).\u003c\/strong\u003e Installing the piston requires opening the refrigerant circuit — recover the charge, replace the piston in the liquid-line body, then evacuate and recharge. Must be handled by an EPA 608-certified technician for proper superheat\/subcooling verification.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058304106867,"sku":"GOODMAN-16138","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-metering-piston-kit-for-asz130181af-heat-pump-b1789851","provider":"National HVAC Parts","version":"1.0","type":"link"}