This black aluminum gas cap is a dome top

Engine Protection: Specifically engineered to extend component life

NOTE: Can be used up to 1985 on the Sportster models if using the early inner cover OEM 17935-48B

Investment-cast 4130 chromoly hinge head with Biltwell wordmark branding

PVC treatment on exterior panels for added weather resistance

MM74L Magneto for Alternator Big Twin Harley Davidsons with Aftermarket Cases - Brushed Finish Outside Diameter_1.5" This black aluminum gas capMorris MM74L Magneto for Alternator Big Twin Harley Davidsons with Aftermarket Cases When building a chopper, custom, or bobber you want to keep everything tight and minimal as possible. A magneto allows you to run your bike without a battery, eliminating a ton of extra wiring and components. The Morris Morris MM74L Magneto features an auto advance, and manual retard for easy starting. Comes standard with a black magneto cap. No returns are accepted