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