The MRCOOL DIY50-1412C-O DIY 18K BTU 1/4 x 1/2 50 ft Mini-Split Line Set with R454B is a pre-charged refrigerant connection kit designed for compatible MRCOOL DIY ductless mini-split HVAC systems. It connects the indoor air handler to the outdoor condenser, allowing R454B refrigerant to circulate and transfer heat efficiently for cooling and heating. The 50-foot length provides flexib... https://www.partshnc.com/mrcool-diy50-1412c-o-50-ft-pre-charged-line-set