Upgrade your small, flimsy plastic fuel cap in your 2008-2019 Ford 6.4L /6.7L Powerstroke with this stylish Billet Fuel Cap from Sinister Diesel. This cap is not only better looking than the factory but is a durable option to keep dirt and moisture out of your fuel tank. This cap is constructed of CNC machined solid billet aluminum and utilizes a tight o-ring seal. The Sinister Diesel Billet Fuel Cap is available in signature Sinister blue, gray, or green, and is laser etched with the Sinister Diesel logo.