{"product_id":"goodman-b1789851-flow-check-piston-kit-0-051-in-orifice","title":"Goodman b1789851 Flow Check Piston Kit 0.051 in Orifice","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe GOODMAN b1789851 is a flow check piston kit designed to regulate refrigerant flow in split-system heat pump and air conditioning equipment. The kit includes a 0.051-inch orifice piston that meters liquid refrigerant entering the indoor coil, controlling the expansion process during both cooling and heating cycles. This type of piston-style metering device is a fixed-orifice component, meaning flow rate is set by the orifice diameter rather than a variable element. HVAC technicians install or replace these pistons during system commissioning, refrigerant circuit servicing, or when converting a system to a different capacity configuration. The unit measures 0.5 inches in height and 15\/32 inches in width, and weighs 0.017 pounds.\u003c\/p\u003e\u003cp\u003eFlow check piston kits are used in residential and light-commercial split systems where a piston-type metering device serves as the primary refrigerant expansion component. The 0.051-inch orifice size corresponds to a specific system capacity and refrigerant type pairing. Technicians select the correct piston diameter based on the outdoor unit capacity and the refrigerant in use. This kit is classified as an accessory and conversion component, making it applicable during system changeouts, coil replacements, or refrigerant conversions where the existing orifice size must be updated to match the new equipment configuration.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e0.051-inch orifice diameter for precise refrigerant metering\u003c\/li\u003e\n\u003cli\u003eFixed-orifice piston design — no moving parts to wear or fail\u003c\/li\u003e\n\u003cli\u003eCompact form factor: 0.5 inches tall, 15\/32 inches wide\u003c\/li\u003e\n\u003cli\u003eLightweight at 0.017 pounds for easy handling during installation\u003c\/li\u003e\n\u003cli\u003eManufactured in the United States\u003c\/li\u003e\n\u003cli\u003eClassified for use as a conversion kit and orifice replacement component\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement piston for GOODMAN split-system heat pump and air conditioning equipment requiring a 0.051-inch flow check piston. Verify orifice size against the equipment nameplate and manufacturer specifications before installation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and replacement of flow check pistons should be performed by a licensed HVAC technician familiar with refrigerant circuit work. Recover all refrigerant and relieve system pressure before opening any refrigerant lines or the piston housing. Confirm the replacement orifice diameter matches the outdoor unit capacity and refrigerant type per the equipment documentation. Follow all applicable EPA Section 608 regulations when handling refrigerants during this service procedure.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrifice Diameter\u003c\/strong\u003e: 0.051 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Height\u003c\/strong\u003e: 0.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Width\u003c\/strong\u003e: 15\/32 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Weight\u003c\/strong\u003e: 0.017 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e: United States\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Class\u003c\/strong\u003e: Conversion Kits and Orifices\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVendor Part Number\u003c\/strong\u003e: 119F3169\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: GOODMAN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: b1789851\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GOODMAN","offers":[{"title":"Default Title","offer_id":51138609348914,"sku":"B1789851","price":26.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/305533700.png?v=1778260130","url":"https:\/\/voomisupply.com\/products\/goodman-b1789851-flow-check-piston-kit-0-051-in-orifice","provider":"Voomi Supply","version":"1.0","type":"link"}