The MRCOOL DIY25-3858-O DIY 3/8 x 5/8 Pre-Charged Quick Connect Line Set 25ft is a refrigerant line set designed for compatible MRCOOL DIY ductless mini-split heat pump and air conditioning systems. It connects the indoor and outdoor units, allowing refrigerant to flow efficiently for heating and cooling operation. Featuring a pre-charged, quick-connect design, it simplifies installat... https://www.partshnc.com/mrcool-25-ft-pre-charged-quick-connect-line-set-diy25-3858-o