Compatible with:Fuel Filter Cap for Ford 7.3L V8 F-series 1999-2003,Excursion 2000-2003,E350 1999-2003,E450 2000-2003,E550 2002-2003.
Reference Numbers:Ford F81Z9G270BA,1831193C91,RK31449,904-203.
Material:6061-T6 Billet aluminum,which is more durable than OEM's plastic cap.Can prevent from causing fuel leaks,air leaks,or other fuel system issues because of the cracked plastic cap.
Hex design:1" Hex design makes you remove/install the cap easier,effectively save your time.
Note:An o-ring is not included with purchase of the cap,but is included with the new fuel filter.