A steel weld-in bung that adds a male AN10 port to steel fabrications. At AN10 you are plumbing for volume rather than pressure gauges: oil cooler feed and return, dry sump scavenge, turbo drains, large fuel feeds and breather lines. Steel is the practical choice for mild steel fuel tanks, fabricated sumps, chassis rails and mounting plates, welded with MIG or TIG, and it keeps the build cost sensible where corrosion is not a factor. Weld all the way around the flange and manage your heat, as the bigger port is more likely to distort. Any AN10 hose end threads straight on and seals on the 37-degree flare.