Genuine PACCAR part. Chrome locking fuel cap. When properly installed, this cap meets all anti-spill normal vent and safety vent requirements for diesel fuel tanks as outlined by DOT. Keys included. Fits any fuel tank with 3.5" filler neck including various Kenworth models, Freightliner 1983 and older, Peterbilt 1979 and older, Western Star 1982 and older.