{"product_id":"oem-goodman-piston-kit-for-asz130301ah-heat-pump-b1789865","title":"OEM Goodman Piston Kit for ASZ130301AH Heat Pump — B1789865","description":"\u003ch2\u003eGoodman B1789865 Piston (Metering Device) Kit\u003c\/h2\u003e\u003cp\u003eThe B1789865 is a genuine Goodman refrigerant metering piston designed for the \u003cstrong\u003eASZ130301AH\u003c\/strong\u003e heat pump condenser. This precision-bored orifice controls refrigerant flow into the indoor coil, ensuring correct superheat\/subcooling and rated efficiency. Installing the factory-matched piston is essential after a coil or line-set change to keep the system charge and capacity within spec.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart number: B1789865\u003c\/li\u003e\n\u003cli\u003eType: Fixed-orifice metering piston \/ flow control\u003c\/li\u003e\n\u003cli\u003eCompatible model: Goodman ASZ130301AH (2.5-ton heat pump)\u003c\/li\u003e\n\u003cli\u003eMaterial: Machined brass insert\u003c\/li\u003e\n\u003cli\u003eApplication: Split-system heat pump condensing unit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM Goodman piston is bore-matched to this unit's rated tonnage for correct refrigerant flow. Generic universal orifices require field drilling or bore selection and can cause improper charge, freeze-ups, or lost capacity. For guaranteed sizing, choose OEM.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate — HVAC technician recommended.\u003c\/strong\u003e Requires system recovery, brazing\/flare access, and re-charge with proper superheat verification. Not a DIY-without-tools job.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058306695539,"sku":"GOODMAN-16215","price":6.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-asz130301ah-heat-pump-b1789865","provider":"National HVAC Parts","version":"1.0","type":"link"}