American 5 gallon gas cans were made starting in 1941. They were re-designed for automated manufacturing techniques, spot welding and roll welding. Early cans were often galvanized. The British and German cans were for the most part manually welded together. Most American made cans have the usual screw on cap, same size as one on a 55 gallon drum. Early cans made for the US Marine Corps used the German style clamp filler neck but the American style can construction. All you ever wanted to know about military fuel cans can be found on the G503 military vehicle forum: https://forums.g503.com/viewforum.php?f=37&sid=295dc12a2eac3d8983c3423902713862 Some people collect them!
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