Carburator Hat / Carb Cover (O-Ring Seal) 5-1/8" Diameter 2-1/2" Tall Fits Holley, Edelbrock, Quadrajet, and Thermoquad. Protects carburetor and engine from dirt and debris during storage Will not fit Holley Dominator or Holley style carbs equipped w/ Manual or electric chokes Carburator Hat / Carb Cover. O-Ring Seal. Protects carburetor and engine from dirt and debris during storage. Perfect for using during a carwash. Will not collapse when tightening air filter nut. 5-1/8" Diameter. 2-1/2" Tall. Fits Holley, Edelbrock, Quadrajet, and Thermoquad. Will not fit Holley Dominator or Holley style carbs equipped w/ Manual or electric chokes.