All Balls Racing - Air Cut off Valve Rebuild Kit (46-1021) Options:(46-1021) the Air Flow model has

the Air Flow model has more vents for more air flow on the shell and on the chin cover

Using DuPont™ Kevlar® lining

it does not fit on all model years

in addition the piston itself is guided by our unique back-plate to prevent piston wear and maintain correct alignment within the slave unit

All Balls Racing - Air Cut off Valve Rebuild Kit (46-1021) Options:(46-1021) the Air Flow model hasKit Includes all necessary parts to rebuild the air cut off valve circuit. Models with multiple carburetors include components to repair all carburetors. Kit includes necessary o rings, diaphragm, spring, screws. Improperly functioning air cut off valves can stick open or closed causing popping on deceleration or poor running conditions.