This is a new 4 pound radiator cap. This is for the M38, M38A1, and M170. It will also fit the MB, GPW, CJ2A and early CJ3A original radiator. This will not fit the late CJ3A radiator that mounts to the grill. (too big) These are over runs from a military contract. They are in perfect condition with little to no storage wear. These also come with the original stay chain. This is a great original item for dressing up that restoration.