Keyed Alike Pair: Road King Truck Parts locking, vented, thermal/pressure relief aluminum fuel cap. 4” nominal size, body made of die cast aluminum. Across threads - cap = 4 3/8” Across threads - filler neck = 4 7/16” Female fitting, inside diameter of cap measures 4.37” 8 TPI NPSL. Includes rubber gasket seal and 13” safety chain with 8” bail. Supplied with 4 matching keys (keys are not available separately) For diesel applications only. Replaces: Velvac️#600181-6 Tectran️#91-8000 Tramec Sloan️#431091