{"product_id":"oem-goodman-piston-kit-for-gmp100-4-system-b1789865","title":"OEM Goodman Piston Kit for GMP100-4 System — B1789865","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1789865 Piston Kit\u003c\/strong\u003e is a genuine OEM refrigerant metering device (flowrator\/piston) for the Goodman \u003cstrong\u003eGMP100-4\u003c\/strong\u003e system. The piston precisely meters refrigerant flow into the evaporator coil, and using the correctly sized OEM orifice is essential for proper superheat, capacity, and efficiency. The wrong piston size directly reduces cooling performance and can damage the compressor.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Piston \/ flowrator metering device kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Meters refrigerant flow to the evaporator coil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit:\u003c\/strong\u003e Goodman GMP100-4 and compatible coil assemblies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e B1789865\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman (genuine OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe genuine OEM piston is drilled to Goodman's precise orifice diameter for the matched system tonnage and refrigerant charge. Generic or mis-sized pistons cause incorrect superheat, flooding, or starving of the coil. For correct system performance, the OEM-specified piston is strongly recommended.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAdvanced (4 of 5).\u003c\/strong\u003e Requires recovering refrigerant, opening the liquid-line connection, replacing the piston in the distributor, and evacuating\/recharging the system. \u003cstrong\u003eEPA Section 608 certification is required\u003c\/strong\u003e — this repair should be performed by a licensed HVAC technician.\u003c\/p\u003e\u003cp\u003eConfirm OEM number B1789865 and the correct orifice size for your system tonnage before ordering for your GMP100-4.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058137088371,"sku":"GOODMAN-11889","price":13.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-piston-kit-for-gmp100-4-system-b1789865","provider":"National HVAC Parts","version":"1.0","type":"link"}