Made from 6061 so welding and anodizing after welding is no issue for the do it yourselfer. Female bung has a provision for an O-ring to seal using most industry standard 37 degree JIC flare/ORB fittings.
Bungs have small step on the back side which allow the bung to register in the hole and makes it easy for alignment and to be welded from both sides if the racer chooses.
Racer can pick fitting size from drop down menu.