For a racer that looks to fab tanks RBS has these Pro-Werks -12 AN female bungs that allow a racer to later install ORB fittings. Threads are 1-1/16 -12, 1.375" hex, 1.120" overall height with a .785" register to drop in the tank before welding begins.
Fittings are sold each.
RBS has 6 so buy one or buy them all and save!!!!!!!!!
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.