The MRCOOL GCNV-VU00-3834 GeoCool No-Vac Vertical Upflow Pre-Charged Line Set is an HVAC installation accessory designed for compatible GeoCool geothermal heat pump systems with vertical upflow configurations. It works by providing a pre-charged, leak-resistant refrigerant connection between the indoor and outdoor components, eliminating the need for vacuuming during installation. Com... https://www.partshnc.com/mrcool-geocool-no-vac-vertical-upflow-pre-charged-line-set-gcnv-vu00-3834