MRCOOL GCNV-VUAB-3834 GeoCool No-Vac Vertical Upflow Line Set with Air Box is a pre-charged refrigerant line set designed for streamlined installation of compatible geothermal HVAC systems. Featuring 3/8-inch and 3/4-inch copper lines, it connects system components and supports efficient refrigerant flow during heating and cooling operation. The integrated air box is designed for vert... https://www.partshnc.com/mrcool-geocool-no-vac-vertical-upflow-pre-charged-line-set-gcnv-vuab-3834