{"product_id":"oem-goodman-refrigerant-piston-kit-for-anz130181aa-b1789851","title":"OEM Goodman Refrigerant Piston Kit for ANZ130181AA — B1789851","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789851 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering device engineered for the \u003cstrong\u003eGoodman ANZ130181AA heat pump\u003c\/strong\u003e. The fixed-orifice piston regulates refrigerant flow into the coil, ensuring correct superheat, efficient heat transfer, and reliable heating and cooling performance. An incorrectly sized or worn piston is a common cause of poor capacity, iced coils, and high energy bills — installing the factory-matched orifice restores the system to its designed specification.\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 ANZ130181AA\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 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 precisely matched to the ANZ130181AA charge and coil. Generic pistons are cheaper but frequently ship with a nominal bore size that deviates from spec, causing charge and superheat problems. For a metering device, exact bore accuracy matters — we recommend OEM for guaranteed system performance.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDifficulty: Advanced (EPA-certified technician required).\u003c\/strong\u003e Replacing a piston requires recovering the refrigerant, opening the sealed system, swapping the orifice at the liquid line connection, evacuating to a deep vacuum, and recharging by weight or subcooling. This is not a DIY repair — improper handling of refrigerant is illegal without EPA 608 certification and can damage the compressor.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058264949107,"sku":"GOODMAN-15130","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-refrigerant-piston-kit-for-anz130181aa-b1789851","provider":"National HVAC Parts","version":"1.0","type":"link"}