Vibrant AN and NPT weld bungs are ideal to help you with your custom plumbing project. They are manufactured from quality materials--mild steel or T6061 billet aluminum--and are available in female NPT, male AN, and female AN thread and O.D. sizes to suit your application--and your budget--perfectly. Let Vibrant help you with aluminum radiators, oil pans, custom tank fabrication, or any other project that requires custom plumbing.