{"product_id":"oem-goodman-piston-kit-for-wghp4336aaa-heat-pump-b1789868","title":"OEM Goodman Piston Kit for WGHP4336AAA Heat Pump — B1789868","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789868 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering device engineered for \u003cstrong\u003eWGHP4336AAA\u003c\/strong\u003e heat pump systems. The piston (also called a flowrator or fixed orifice) controls refrigerant flow into the coil, ensuring correct superheat, proper capacity, and efficient operation. A worn, mismatched, or missing piston causes poor cooling, icing, and high energy bills — making this an essential part for any coil or system replacement.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1789868\u003c\/li\u003e\n\u003cli\u003eCompatible Model: WGHP4336AAA\u003c\/li\u003e\n\u003cli\u003eType: Fixed-orifice piston \/ flowrator metering device\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman\u003c\/li\u003e\n\u003cli\u003eApplication: Heat pump refrigerant control\u003c\/li\u003e\n\u003cli\u003eFit: Direct OEM exact-fit replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eOur \u003cstrong\u003eOEM B1789868\u003c\/strong\u003e is bored to the precise factory orifice diameter for the WGHP4336AAA, guaranteeing rated capacity and efficiency. Generic universal pistons require manual orifice selection and can mis-meter refrigerant, risking compressor damage and lost performance. For warranty-sensitive and matched-system work, the OEM piston is the safe choice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate\u003c\/strong\u003e — requires recovering refrigerant, opening the line set or coil, and EPA 608 certification. Recommended for licensed HVAC technicians.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Direct Replacement","offer_id":63032346902899,"sku":"B1789868-GEN","price":12.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048293745011,"sku":"B1789868","price":16.84,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-piston-B1789868.jpg?v=1782949988","url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-wghp4336aaa-heat-pump-b1789868","provider":"National HVAC Parts","version":"1.0","type":"link"}