Custom lathed out of Brass and aviation grade 6061t Aluminum.
Knurled sides for extra grip - the lower threaded part of the cap in aluminum has a spring-bound valve system centrally located in the middle of the bung. This connects to 3 vents in the top part of the cap to allow alleviation of any pressure that may build up inside the tank.
It also comes with a petrol-resistant o-ring seal that sits on the top of the thread.
Some models it will fit include Bonneville, T100, America, Speedmaster, Thruxton. It will also fit on the HD Sportster and probably a load of other models.
FITS ALL YEARS BONNEVILLE THRUXTON AMERICA T100 SPEEDMASTER SE SCRAMBLER : 2001-2015 Present - Fits both CARB and EFI bikes.