The MRCOOL DIY25-1438-O DIY 1/4 x 3/8 Pre-Charged Mini Split Line Set is a 25-foot connection kit designed for MRCOOL DIY ductless mini-split air-conditioning and heat-pump systems. It includes pre-charged refrigerant lines that connect the indoor evaporator unit to the outdoor condenser, allowing refrigerant to circulate efficiently without requiring field charging during installatio... https://www.partshnc.com/mrcool-diy-line-set-diy25-1438-o