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The MRCOOL 25 ft. Pre-Charged 3/8" x 3/4" No-Vac Quick Connect Line Set (NV25-3834) is specifically designed for use with MRCOOL Universal Series systems and 1st Generation Central Ducted systems (R-410A) . This kink-resistant, pre-charged line set delivers a fast, reliable installation without the need for vacuuming, brazing, or additional refrigerant charging. ⚠️ IMPORTANT COMPATIBILITY NOTICE ✅…