2013-2017 Dodge Ram Diesel Magnetic Aluminum Fuel Cap Strong Magnet on bottom of cap to allow attachment to steel door while fueling Extremely long life Buna-N O-ring to keep dust and dirt out of the fuel filler neck Fits all 2013-2017 Dodge Ram diesel trucks with a 'capless' fuel system Machined from Billet Aluminum (100% Manufactured in Montana USA) Proudly Made and designed in the USA