{"product_id":"hvac-flare-coupler-connectors-for-traditional-refrigerant-line-sets-1-4-x-3-8-1-4-x-1-2-1-4-x-5-8-3-4-x-3-8-brass-line-set-unions-for-mini-split-residential-hvac-systems","title":"HVAC Flare Coupler Connectors for Traditional Refrigerant Line Sets | 1\/4 x 3\/8, 1\/4 x 1\/2, 1\/4 x 5\/8, 3\/4 x 3\/8 Brass Line Set Unions for Mini Split \u0026 Residential HVAC Systems","description":"\u003cdiv class=\"product-description\"\u003e\n  \u003cp\u003e\u003cstrong\u003eHVAC flare coupler connectors\u003c\/strong\u003e for joining two \u003cstrong\u003etraditional flared refrigerant lines\u003c\/strong\u003e in mini split and residential HVAC applications. These solid brass flare union fittings are designed for use when combining or extending compatible \u003cstrong\u003etraditional line sets\u003c\/strong\u003e that use standard flare connections.\u003c\/p\u003e\n\n  \u003cp\u003eThese fittings are commonly used in \u003cstrong\u003emini split installations\u003c\/strong\u003e, heat pump systems, ductless air conditioner systems, and other residential HVAC applications where properly sized flare refrigerant lines need to be connected together. Available sizes cover many common line set combinations used across major brands.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e These connectors are for \u003cstrong\u003etraditional HVAC flare line sets only\u003c\/strong\u003e. They are \u003cstrong\u003enot for use on MRCOOL DIY Series\u003c\/strong\u003e, the original true DIY pre-charged system design. Even though some brands may market similar fittings as “DIY,” any HVAC refrigerant system that is opened to atmosphere must be properly installed using approved HVAC practices, including evacuation to remove oxygen, air, and moisture. Failure to properly evacuate the system can introduce contamination, cause serious system damage, reduce performance, and may void the factory warranty.\u003c\/p\u003e\n\n  \u003ch3\u003eAvailable Sizes \u0026amp; Common Applications\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\" border=\"1\" cellpadding=\"8\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eConnector Size\u003c\/th\u003e\n        \u003cth\u003eCompatible Copper Pipe OD\u003c\/th\u003e\n        \u003cth\u003eCommon HVAC Application\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e1\/4\" x 3\/8\"\u003c\/td\u003e\n        \u003ctd\u003e1\/4\" OD + 3\/8\" OD\u003c\/td\u003e\n        \u003ctd\u003eCommon for 6k, 9k, and 12k mini split systems including many MRCOOL and other brand applications using 1\/4\" liquid and 3\/8\" suction lines\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e1\/4\" x 1\/2\"\u003c\/td\u003e\n        \u003ctd\u003e1\/4\" OD + 1\/2\" OD\u003c\/td\u003e\n        \u003ctd\u003eCommon for 18k mini split systems including many MRCOOL and other compatible brands using 1\/4\" liquid and 1\/2\" suction lines\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e1\/4\" x 5\/8\"\u003c\/td\u003e\n        \u003ctd\u003e1\/4\" OD + 5\/8\" OD\u003c\/td\u003e\n        \u003ctd\u003eUsed on select higher-capacity residential ductless and heat pump applications that require 1\/4\" liquid and 5\/8\" suction line connections\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e3\/4\" x 3\/8\"\u003c\/td\u003e\n        \u003ctd\u003e3\/4\" OD + 3\/8\" OD\u003c\/td\u003e\n        \u003ctd\u003eCommon for 24k and 36k air handler applications using 3\/8\" liquid and 3\/4\" suction lines\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eSeries Specifications\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\" border=\"1\" cellpadding=\"8\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eConnector Model\u003c\/th\u003e\n        \u003cth\u003eCompatible Copper Pipe Outer Diameter\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e1\/4\u003c\/td\u003e\n        \u003ctd\u003e1\/4in (6.35mm)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e3\/8\u003c\/td\u003e\n        \u003ctd\u003e3\/8in (9.52mm)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e1\/2\u003c\/td\u003e\n        \u003ctd\u003e1\/2in (12.70mm)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e5\/8\u003c\/td\u003e\n        \u003ctd\u003e5\/8in (15.88mm)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e3\/4\u003c\/td\u003e\n        \u003ctd\u003e3\/4in (19.05mm)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDesigned to join two traditional \u003cstrong\u003eflared HVAC refrigerant lines\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCompatible with many \u003cstrong\u003emini split, ductless, and residential HVAC systems\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003eSolid brass construction for durability and dependable fitment\u003c\/li\u003e\n    \u003cli\u003eAvailable in common line set size combinations used across multiple brands\u003c\/li\u003e\n    \u003cli\u003eIdeal for properly installed and evacuated systems using standard flare connections\u003c\/li\u003e\n    \u003cli\u003eSuitable for use with all common residential refrigerants when used in a properly engineered and properly installed system\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCommon Search Uses\u003c\/h3\u003e\n  \u003cp\u003eCustomers often search for these fittings as \u003cstrong\u003emini split flare couplers\u003c\/strong\u003e, \u003cstrong\u003eHVAC flare union fittings\u003c\/strong\u003e, \u003cstrong\u003erefrigerant line coupler connectors\u003c\/strong\u003e, \u003cstrong\u003ebrass flare connectors for line sets\u003c\/strong\u003e, \u003cstrong\u003eductless mini split line set unions\u003c\/strong\u003e, or \u003cstrong\u003eflare fittings for traditional refrigerant lines\u003c\/strong\u003e.\u003c\/p\u003e\n\n  \u003ch3\u003eImportant Compatibility Note\u003c\/h3\u003e\n  \u003cp\u003eAlways verify your system’s required \u003cstrong\u003eliquid line size\u003c\/strong\u003e and \u003cstrong\u003esuction line size\u003c\/strong\u003e before ordering. These fittings are sized by the copper tubing outside diameter used in standard HVAC line sets. Proper installation, torque, evacuation, pressure testing, and charging procedures should always be followed according to manufacturer requirements and accepted HVAC industry practices.\u003c\/p\u003e\n\n  \u003ch3\u003eNot for MRCOOL DIY Series\u003c\/h3\u003e\n  \u003cp\u003eThese coupler connectors are \u003cstrong\u003enot compatible with the original MRCOOL DIY Series pre-charged Quick Connect system\u003c\/strong\u003e. They are intended only for \u003cstrong\u003etraditional flare-type refrigerant line sets\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"MRCOOL DIY Direct","offers":[{"title":"1\/4\" - 3\/8\"","offer_id":49175938466019,"sku":"FU-KIT-1\/4-3\/8","price":18.5,"currency_code":"USD","in_stock":true},{"title":"1\/4\"- 1\/2\"","offer_id":49175938498787,"sku":"FU-KIT-1\/4-1\/2","price":18.5,"currency_code":"USD","in_stock":true},{"title":"1\/4\" - 5\/8\"","offer_id":49175938531555,"sku":"FU-KIT-1\/4-5\/8","price":18.5,"currency_code":"USD","in_stock":true},{"title":"3\/8\" - 5\/8\"","offer_id":49175938564323,"sku":"FU-KIT-3\/8-5\/8","price":18.5,"currency_code":"USD","in_stock":true},{"title":"3\/8\" - 3\/4\"","offer_id":49175938597091,"sku":"sku-51606347448637","price":18.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0706\/8752\/3043\/files\/5a2ad8f5d74b8e5845276e28f8ae4994f034402b699417ddb85ec09474bff5e0.webp?v=1780842870","url":"https:\/\/freedomhvacsupply.com\/products\/hvac-flare-coupler-connectors-for-traditional-refrigerant-line-sets-1-4-x-3-8-1-4-x-1-2-1-4-x-5-8-3-4-x-3-8-brass-line-set-unions-for-mini-split-residential-hvac-systems","provider":"Freedom HVAC Supply","version":"1.0","type":"link"}