The MRCOOL NV25-3834 Charged Line Set is an HVAC installation accessory designed to provide a fast, reliable connection between compatible indoor and outdoor units. Pre-charged with refrigerant and equipped with secure fittings, it works by enabling a tool-free connection that simplifies installation while maintaining proper refrigerant flow. Commonly used with MRCOOL ductless mini-sp... https://www.partshnc.com/mrcool-25-ft-pre-charged-line-set-nv25-3834