Please measure the diameter of your current fuel cap or fuel tank fill tube prior to ordering. One keyed alike pair, 3” diameter, 8 UNNS locking aluminum diesel fuel caps. Fits Volvo VNL series ultra low sulfur labeled or PNG tanks 2010 & later. Cap is not vented, fuel tank must be vented, for low sulfur diesel applications only. Includes rubber gasket seal, safety chain, and bail. Supplied with 4 matching keys (keys are not available separately). Approximate dimensions = Across threads cap 3” Approximate net weight pair = 1 lb 5 oz Replaces: Volvo️#20770691