A steel weld-in bung creating a male AN8 port in steel fabrications. AN8 is the practical size once flow demand climbs past what AN6 comfortably supports, so it turns up on main fuel feeds for boosted engines, oil cooler lines, turbo drains and surge tank inlets and outlets. Steel welds cleanly into mild steel fuel tanks, sumps, chassis rails and brackets with MIG or TIG, and is the sensible budget option when the area will be sealed or painted. Weld the full circumference for a leak-free joint, avoid dumping excessive heat into the flange, and check the 37-degree seat is clean and undamaged before you fit the hose end.