The MRCOOL NV25-3834 No-Vac Line Set is a 25-foot pre-charged refrigerant line set featuring 3/8-inch and 3/4-inch copper tubing for compatible MRCOOL ductless mini-split systems. It connects the indoor air handler to the outdoor condenser, allowing refrigerant to circulate for efficient heating and cooling. The pre-charged design helps simplify installation by reducing evacuation req... https://www.partshnc.com/mrcool-25-ft-pre-charged-line-set-nv25-3834