The MRCOOL DIY25-1412-O is a 25-foot, pre-charged mini-split line set designed for MRCOOL DIY ductless mini-split systems using R-454B refrigerant. 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 simplifies installation by reducing pr... https://www.partshnc.com/mrcool-diy25-1412-o-25ft-pre-charged-mini-split-line-set