The MRCOOL GCNV-VUAB-3834 GeoCool No-Vac Vertical Upflow With Air Box Lineset is a pre-charged refrigerant lineset designed for efficient installation of compatible GeoCool geothermal heat pump systems. It connects the indoor heat pump components to the geothermal system, allowing refrigerant to circulate between the equipment without requiring traditional evacuation procedures during... https://www.partshnc.com/mrcool-geocool-no-vac-vertical-upflow-pre-charged-line-set-gcnv-vuab-3834