The MRCOOL DIY25-1412-O DIY 9K, 12K & 18K BTU Mini Split Line Set is a 25-foot pre-charged refrigerant line set designed for compatible MRCOOL DIY ductless mini-split systems. Featuring 1/4-inch and 1/2-inch copper lines, it connects the indoor air handler to the outdoor condenser, allowing refrigerant to circulate efficiently for heating and cooling. The pre-charged design helps sim... https://www.partshnc.com/mrcool-diy25-1412-o-25ft-pre-charged-mini-split-line-set