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The Sinister Diesel Billet Fuel Plug/Cap for the 2013+ Cummins is a stylish and durable option to keep dirt and moisture from entering your fuel tank. The factory uses a small, flimsy plastic plug whereas the Sinister Diesel Fuel Plug is CNC Machined from solid billet aluminum and utilized a tight O-ring seal. Then to top it off, Sinister has laser-etched their Sinister Diesel logo and anodized