The Built Bottom End Performance -10AN weld bung provides an easy way to add a male AN port to your build. Use for turbo oil drain systems, coolant overflow tanks, catch cans, and more. Cleaning of the bung and part to be welded before welding is recommended for the best results. The thick flange provides optimal mass for welding, and allows for strong penetration. Take your build to the next level with Built Bottom End Performance fittings.