{"product_id":"oem-goodman-piston-metering-kit-for-ash130181ab-b1789852","title":"OEM Goodman Piston \/ Metering Kit for ASH130181AB — B1789852","description":"\u003ch2\u003eGoodman B1789852 Piston (Flow-Rater) Kit\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eGoodman B1789852\u003c\/strong\u003e is a genuine OEM refrigerant metering piston kit sized for the \u003cstrong\u003eASH130181AB\u003c\/strong\u003e heat pump. Also called a flow-rater, this fixed-orifice piston meters liquid refrigerant into the evaporator or condenser coil at the exact rate required to match the system's rated capacity. A correctly sized piston is essential for proper superheat, subcooling, and efficiency.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789852\u003c\/li\u003e\n\u003cli\u003eComponent: Fixed-orifice metering piston (flow-rater)\u003c\/li\u003e\n\u003cli\u003eEquipment: Split-system heat pump\u003c\/li\u003e\n\u003cli\u003eCompatible Model: ASH130181AB\u003c\/li\u003e\n\u003cli\u003eType: Factory-calibrated orifice\u003c\/li\u003e\n\u003cli\u003eFit: Direct OEM replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePiston bore diameter is matched to the tonnage of your specific unit. An \u003cstrong\u003eOEM Goodman\u003c\/strong\u003e piston guarantees the correct orifice size for the ASH130181AB, while a mismatched generic piston can starve or flood the coil, cutting capacity and driving up energy use. When in doubt, always match OEM.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty: Moderate\u003c\/h3\u003e\u003cp\u003eThe piston seats inside the metering-device housing at the coil connection. Access typically requires recovering refrigerant and opening the flare\/braze union, then pulling a vacuum and recharging. Best handled by an EPA-certified technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058300174707,"sku":"GOODMAN-15936","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-metering-kit-for-ash130181ab-b1789852","provider":"National HVAC Parts","version":"1.0","type":"link"}