The MRCOOL NV25-3834-O Central Ducted 25 Ft 3/8 x 3/4 R-454B No-Vac Pre-Charged Line Set is a factory-prepared refrigerant piping assembly designed for compatible central ducted HVAC systems. It provides a sealed pathway for refrigerant to circulate between the outdoor condenser and indoor air handler, supporting efficient heating and cooling. Pre-charged with R-454B refrigerant, it s... https://www.partshnc.com/mrcool-no-vac-pre-charged-line-set-nv25-3834-o