Please measure the diameter of your current fuel cap or fuel tank fill tube prior to ordering. One 3 1/2” diameter, locking, die-cast aluminum diesel fuel cap. Female fitting, non-vented, fuel tank must be vented, for diesel application only. Includes viton gasket seal, safety chain, and bail. Supplied with 2 matching keys (keys are not available separately). Replaces: Navistar International️#3591620C2 Approximate dimensions = Across threads cap 3 1/2” Approximate net weight = 11 oz