100% Aluminum core construction with billet machined aluminum filler neck. Tig welded for exceptional strength and quality. Fin covers enclose the top and bottom for protection, a clean look and ease of installation. Screw-in universal inlet, (will accept 1-1/2″ hose, -16 AN or -20 AN fittings, sold separately), 1-3/4″ outlet, 3″ thick furnace brazed core with no epoxy used. Radiator cores feature 2 rows of 1″ tubes for cooling efficiency.