The Atlas ATCR fitting provides the solution that delivers liquids and gases to an assembly of cryopanels that join together to form a thermally controlled and uniform test area for the Magnetospheric Multiscale Mission at NASA’s Goddard Space Center. Aluminum extrusion is welded to the cryopanels in a serpentine pattern which ultimately connects to the stainless steel delivery lines. The Atlas ATCR fittings provide a compatible, demountable transition from the aluminum lines to their stainless steel counterparts.