Please measure the diameter of your current fuel cap or fuel tank fill tube prior to ordering. One 2 1/4” diameter 11.5 TPI, locking, die-cast aluminum diesel fuel cap. Female fitting, non-vented, fuel tank must be vented, for diesel application only. Includes rubber gasket seal, safety chain, and bail. Supplied with 2 matching keys (keys are not available separately). Approximate dimensions = Across threads cap 2 1/4”, Across threads filler neck 2 5/16” Approximate net weight = 7 oz