The MRCOOL DIY25-3858 DIY 3/8 x 5/8 25 ft Line Set is a pre-insulated refrigerant line designed for use with MRCOOL DIY 24K and 36K ductless mini-split air conditioning and heat pump systems. It connects the indoor air handler to the outdoor condenser, allowing refrigerant to circulate efficiently for reliable heating and cooling performance. Engineered for simplified installation, th... https://www.partshnc.com/mrcool-diy-line-set-diy25-3858