{"product_id":"oem-goodman-piston-flowrator-kit-for-asz130301ag-heat-pump-b1789865","title":"OEM Goodman Piston \/ Flowrator Kit for ASZ130301AG Heat Pump — B1789865","description":"\u003ch2\u003eGoodman B1789865 Piston (Flowrator) Kit\u003c\/h2\u003e\u003cp\u003eThe B1789865 is a genuine OEM refrigerant metering piston — often called a flowrator — designed for the Goodman \u003cstrong\u003eASZ130301AG\u003c\/strong\u003e 13 SEER, 2.5-ton heat pump. The piston seats inside the metering device body and controls the precise flow of R-410A into the coil. Its fixed orifice diameter is matched to the tonnage of the unit; using the wrong bore size causes flooding or starvation, poor subcooling, and lost capacity in both heating and cooling modes.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart type: Fixed-orifice metering piston \/ flowrator\u003c\/li\u003e\n\u003cli\u003eOEM part number: B1789865\u003c\/li\u003e\n\u003cli\u003eFits: Goodman ASZ130301AG (2.5 ton \/ 30,000 BTU heat pump)\u003c\/li\u003e\n\u003cli\u003eRefrigerant: R-410A\u003c\/li\u003e\n\u003cli\u003eOrifice: Factory-drilled to ASZ13 2.5-ton spec\u003c\/li\u003e\n\u003cli\u003eIncludes: Piston and Teflon seal ring\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM B1789865\u003c\/strong\u003e ships with the exact bore size Goodman specifies for this coil-and-condenser pairing. Generic piston assortments are inexpensive but require you to cross-reference the correct drill size — an easy place to introduce a performance fault. At this price point, the OEM piston removes the guesswork.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAdvanced (4\/5)\u003c\/strong\u003e — Requires EPA 608 certification. The refrigerant must be recovered, the metering device body opened, the piston swapped and re-sealed, then the system evacuated and recharged. Small part, but it lives inside the sealed refrigerant circuit — leave it to a licensed technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058306367859,"sku":"GOODMAN-16211","price":6.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-flowrator-kit-for-asz130301ag-heat-pump-b1789865","provider":"National HVAC Parts","version":"1.0","type":"link"}