The MRCOOL GCNV-VD00-3834 GeoCool No-Vac Geothermal Pre-Charged Line Set is a pre-charged refrigerant connection designed for fast, efficient installation of compatible geothermal HVAC systems. It eliminates the need for on-site vacuuming and refrigerant charging, reducing installation time and minimizing the risk of contamination. Engineered for use with MRCOOL GeoCool geothermal hea... https://www.partshnc.com/mrcool-geocool-no-vac-vertical-downflow-3-8-3-4-pre-charged-lineset-gcnv-vd00-3834