MRCOOL DIY25-3858-O DIY 3/8 x 5/8 Pre-Charged Quick Connect Line Set 25 ft is a refrigerant line set designed to connect compatible indoor and outdoor ductless HVAC units. It works by providing a sealed, pre-charged pathway for refrigerant to circulate efficiently between system components using quick-connect fittings, eliminating the need for vacuuming during installation. Designed f... https://www.partshnc.com/mrcool-25-ft-pre-charged-quick-connect-line-set-diy25-3858-o