Custom lathed out of aviation grade 6061t Aluminum.

This sale is for the complete new cap fully assembled and ready to fit on your bike.

Sides of the top cap knurled for extra grip - the lower threaded part of the cap 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 all post 1983 Harleys with regular right hand thread

FITS ALL YEARS BONNEVILLE THRUXTON, AMERICA, T100, SPEEDMASTER, SE, SCRAMBLER, BOBBER, STREET TWIN, STREET CUP, STREET SCRAMBLER, T120 : 2001-2025 - Fits both CARB and EFI bikes.

** NOT SUITABLE FOR 2026+ TRIUMPH MODELS, CURRENTLY UNDER DEVELOPMENT **

FITS ALL YEARS HARLEY DAVIDSON WITH SCREW DOWN CAP 1981-2018 PRESENT SPORTSTER, 48, IRON ETC