MRCOOL GCIK-CL4T-AM GeoCool Inverter Series 4 Ton Closed Loop Installation Kit is an accessory package designed to simplify installation of compatible geothermal HVAC systems. It works by providing essential components for connecting the heat pump to a closed-loop ground heat exchanger, allowing fluid to circulate efficiently for effective heat transfer. Designed for use with compatib... https://www.partshnc.com/mrcool-geocool-inverter-series-4-ton-closed-loop-geothermal-installation-kit-with-angled-manifold-gcik-cl4t-am