{"product_id":"oem-goodman-flow-check-piston-kit-for-anz130601aa-b1789888","title":"OEM Goodman Flow Check Piston Kit for ANZ130601AA — B1789888","description":"\u003ch2\u003eGenuine Goodman B1789888 Flow Check Piston Kit\u003c\/h2\u003e\u003cp\u003eThe Goodman B1789888 flow check piston kit contains the refrigerant metering device (flowrator) matched to the \u003cstrong\u003eANZ130601AA\u003c\/strong\u003e heat pump. The piston is a precisely bored orifice that regulates refrigerant flow into the coil, and the spring-loaded flow-check design allows full-flow in one direction for correct heat-pump reversing operation. Using the exact factory bore size is essential — even a few thousandths of an inch off changes superheat, subcooling, and capacity, so a genuine OEM piston keeps your system running at rated efficiency.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789888\u003c\/li\u003e\n\u003cli\u003eCompatible Model: ANZ130601AA (Goodman Heat Pump)\u003c\/li\u003e\n\u003cli\u003eComponent Type: Flow check piston \/ flowrator metering device kit\u003c\/li\u003e\n\u003cli\u003eFunction: Meters refrigerant into the coil\u003c\/li\u003e\n\u003cli\u003eFit: Direct OEM replacement — factory-drilled orifice size\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eGeneric piston assortments force you to guess the bore, and an incorrect orifice causes flooding, starving, or poor capacity. The genuine Goodman B1789888 arrives pre-sized for the ANZ130601AA, eliminating trial-and-error and protecting the compressor from off-design refrigerant conditions.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eRating: Professional (4\/5).\u003c\/strong\u003e The piston sits inside the refrigerant circuit, so replacement requires recovering the charge, opening the metering fitting, seating the new piston in the correct orientation, then evacuating and recharging. EPA 608 certification is required — leave this to a licensed technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058266489203,"sku":"GOODMAN-B1789888","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-flow-check-piston-kit-for-anz130601aa-b1789888","provider":"National HVAC Parts","version":"1.0","type":"link"}