Billet Aluminum DEF Cap for 2013-2016 Dodge Ram Cummins and Ecodiesel 1500/2500/3500/4500/5500 6.7L 3.0L Deisel Exhuast Fluid This beautiful billet aluminum DEF Cap is the perfect addition to any Dodge Ram or Ecodiesel vehicle! This DEF cap can be used with the existing tether on the stock DEF cap. Simply pop out the old DEF cap and pop in your new billet aluminum cap for a great new look in minutes! Fitment: 2013-2016 Dodge Ram Diesel Cummins and Ecodiesel vehicles. CNC Machined from solid billet aluminum and Anodized Blue for durability and aesthetics. Each Diesel Exhaust Fluid Cap comes with two O-rings for a secure and snug fit every time. Each Cap is laser etched with the word DEF for proper identification.