NOS adjustable main jet for Dellorto UA 14-19mm and UB 20-24mm carbs. These were the hot set up for racing bikes in the 1960's and usually found on Rupp Black Widow mini bikes. This parts replaces the stock banjo bolt that holds on your float bowl and needs no modification to install. Comes with new sealing washers and does not fit other models of Dellorto carb.
NOTE: These new old stock adjusters are in limited supply !!