Note: This fuel cap will only fit Peterbilt tanks that currently utilize this same style cap. One locking, aluminum, lever style, diesel fuel cap. Body made of heavy duty die-cast aluminum, for diesel applications only. Fuel cap is not vented, contains pressure relief. Male fitting, Includes viton gasket seal, safety chain, and bail. Supplied with 2 matching keys (keys are not available separately). Replaces: Peterbilt️#11-04859-200