Clarke Fuel Tank Gas Cap Replacement Dirt Bike Fuel Tanks | Rocky Mountain ATV/MC Tusk Billet Aluminum Gas Cap Each gas cap comes with a specially designed rubber gasket that prevents leaking. Clarke Billet Aluminum Gas Cap without Logo - MX1 Canada Gas caps feature a laser etched logo and a polished anodized finish adds inchbling inch to your motorcycle, ATV, or UTV. Fits only Clarke fuel tanks. If your existing clarke cap has a cork type gasket; this cap will not work. The cap with the cork gasket is found on older Clarke tanks. Made of 6061 T-6 Billet Aluminum. Includes Tusk Gas Tank Vent Valve Tusk Billet Aluminum Gas Caps are made from quality 6061 T-6 Billet Aluminum. Clarke Replacement Fuel Cap - MX1 Canada Includes Tusk Gas Tank Vent Valve.