The MRCOOL NV50-3834-O No-Vac Pre-Charged 50 Ft Line Set is a factory-sealed refrigerant line designed to simplify the installation of compatible R-454B MRCOOL ductless mini-split and heat pump systems. Its pre-charged, no-vacuum design allows for faster setup by reducing the need for specialized charging procedures and installation time. https://www.partshnc.com/mrcool-nv50-3834-o-50-ft-pre-charged-no-vac-line-set