{"product_id":"oem-goodman-refrigerant-piston-kit-for-anz130181ab-b1789851","title":"OEM Goodman Refrigerant Piston Kit for ANZ130181AB — B1789851","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789851 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering device engineered for the \u003cstrong\u003eGoodman ANZ130181AB heat pump\u003c\/strong\u003e. The fixed-orifice piston controls the rate of refrigerant flow into the coil, setting the superheat and ensuring efficient, reliable heating and cooling. A worn, clogged, or wrong-sized piston leads to poor capacity, coil frosting, and elevated energy costs — replacing it with the factory-matched orifice returns the system to its designed operating point.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e B1789851\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Fixed-orifice refrigerant piston \/ metering device\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Model:\u003c\/strong\u003e Goodman ANZ130181AB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment:\u003c\/strong\u003e Split-system heat pump condenser\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass orifice with integral filter screen\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis is a \u003cstrong\u003egenuine Goodman OEM part\u003c\/strong\u003e with a factory-calibrated orifice bore matched to the ANZ130181AB refrigerant charge and coil design. Generic pistons often deviate from the specified bore diameter, throwing off superheat and charge balance. Because metering accuracy depends on an exact bore, OEM is the recommended choice for correct system performance.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDifficulty: Advanced (EPA-certified technician required).\u003c\/strong\u003e Replacing the piston means recovering refrigerant, opening the sealed system at the liquid-line connection, swapping the orifice, evacuating to a deep vacuum, and recharging by weight or subcooling. Refrigerant handling requires EPA 608 certification — this is a professional repair, not a DIY task.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058265047411,"sku":"GOODMAN-15134","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-refrigerant-piston-kit-for-anz130181ab-b1789851","provider":"National HVAC Parts","version":"1.0","type":"link"}