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MRCOOL® No-Vac® Pre-Charged Line Set – 3/8" x 3/4" for Universal® 2nd Gen, Hyper Heat 2nd Gen, VersaPro® 2nd Gen & Cased A-Coil Systems Complete your MRCOOL® central ducted HVAC installation with the MRCOOL® No-Vac® Pre-Charged Line Set , engineered specifically for R-454B refrigerant systems . Designed for compatibility with MRCOOL® Universal® 2nd Gen , Hyper Heat 2nd Gen , VersaPro® 2nd Gen …