This billet adapter kit includes everything you need to set up your gas tank with a 2.5″ Monza Flip-Up Gas Cap (not included). Once installed, the cap stays threaded in, and you simply push the release to flip your gas cap open and fill your tank. This screw-in style adapter fits Harley-Davidsons 1983 & later, as well as Triumph Twins 2001-2015 (T100, Thruxton, SE, Scrambler) and Triumph Twins 2016-Present (Bobber, T100, T120, Street Cup, Street Twin etc).