Oil Fill Cap - E.D Billet One Solid Piece - Cummins 5.9L & 6.7L 2003 - Present ONE SOLID PIECE! Unlike caps from other manufacturers, our billet cap is NOT a cover for your current cap. Our billet cap REPLACES your current cap. Cummins 5.9L & 6.7L 2003 - Present Includes O-Ring Machined in house at Engineered Diesel! Anodized Black and laser etched