The MRCOOL NV35-3834 Charged Line Set is an HVAC installation accessory designed to connect compatible indoor and outdoor units in ductless mini-split and heat pump systems. Pre-charged with refrigerant, it works by providing a secure, leak-resistant connection that supports efficient refrigerant flow without requiring specialized charging equipment during installation. Commonly used ... https://www.partshnc.com/mrcool-35-ft-pre-charged-line-set-nv35-3834