AN-4 4AN 7/16x20 UNF MILD STEEL FEMALE WELD ON BUNG BOSS Adapter Oil Fuel Tank
AN-4 7/16x20 UNF MILD STEEL LOW PROFILE WELD ON BOSS ADAPTER. AN-4 (ORB-4) female threaded mild steel low profile weld on boss adapter, weld this onto your fuel cell, oil cooler, catch tank, swirl pot or any other steel tank etc.