Fits 2013-2018 RAM Cummins Turbo Diesel and 2014-2018 RAM Ecodiesel. Get a deal by buying both an EZ-Loc and a DEF-Loc at the same time! Each combo purchase comes with the EZ-Loc cap, the DEF-Loc cap and one Secure Key with complimentary stainless steel key ring. Both caps have venting features. Additional keys can be purchased using the information from our Secure Keys page. The DEF-Loc is not designed to work with the OEM DEF cap tether, but a BEM Auto tether is available for purchase.