{"product_id":"oem-goodman-piston-metering-kit-for-asz130361ae-b1789868","title":"OEM Goodman Piston \/ Metering Kit for ASZ130361AE — B1789868","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789868 Piston Kit\u003c\/strong\u003e is the genuine OEM refrigerant metering device (flowrator\/orifice) matched to the \u003cstrong\u003eASZ130361AE\u003c\/strong\u003e 3-ton 13-SEER R-410A heat pump. The piston's precision-bored orifice sets the refrigerant flow rate into the indoor coil, which is essential for correct superheat\/subcooling, rated capacity, and efficiency. Using the factory-specified bore size is critical to proper system charge and performance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart number: B1789868\u003c\/li\u003e\n\u003cli\u003eComponent: Refrigerant piston \/ flowrator metering orifice kit\u003c\/li\u003e\n\u003cli\u003eRefrigerant: R-410A\u003c\/li\u003e\n\u003cli\u003eApplication: Indoor coil metering for 3-ton ASZ13 heat pump\u003c\/li\u003e\n\u003cli\u003eFits: Goodman ASZ130361AE and matched air handler \/ coil combinations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM B1789868 is bored to Goodman's exact orifice diameter for this tonnage and refrigerant. An incorrect or generic piston size will over- or under-feed the coil, causing poor cooling, iced coils, or compressor stress. Always confirm the bore size stamped on the piston matches the unit's rating plate.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty: Professional (EPA certification required)\u003c\/h3\u003e\u003cp\u003eThis is not a DIY part — replacing a piston requires opening the sealed refrigerant circuit. A licensed HVAC technician must recover the R-410A, replace the piston at the metering fitting, evacuate the system, and recharge to spec. EPA Section 608 certification is legally required to handle refrigerant.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058308465011,"sku":"GOODMAN-16243","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-metering-kit-for-asz130361ae-b1789868","provider":"National HVAC Parts","version":"1.0","type":"link"}