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MRCOOL 15 ft. No-Vac Pre-Charged Line Set – 3/8" x 3/4" for R-454B Central Ducted Systems Upgrade or complete your compatible MRCOOL central ducted heat pump installation with the MRCOOL 15 ft. No-Vac Pre-Charged Line Set . This genuine MRCOOL line set is designed for Hyper Heat 2nd Gen and VersaPro 2nd Gen Central Ducted Systems that use R-454B refrigerant . With factory pre-charged refrigerant l…