Ace Race Parts 17005 Tank Weld Bung with Thread On Cap - 2.000 ID - 6061 AluminumAce Race Parts 17005 Tank Weld Bung with Thread On Cap 2. 000" ID 6061 Aluminum Ace Race Parts offers Tank Weld Bungs that are precision CNC machined from solid 6061 Aluminum billet and come with a thread on cap featuring an O Ring. We provide Ace Race Parts Tank Filler Necks, or Tank Weld Bungs, in five sizes, which can be used to fabricate a wide variety of tanks. FEATURES 6061 T6 Aluminum Precision CNC Machining Includes Black thread on Tank Cap