Tool Mercury Free Carburetor SyncPro™Caracteristicas: Precise four channel vacuum indicator designed specifically for intake synchronization of engines with multiple carburetors or throttle bodies Includes manometer fluid, hoses, 5 mm adapters, in line restrictors and instructions Spill proof design means the tool can be stored in a horizontal or vertical position For use with any two , three or four cylinder 4 stroke engines 5 mm adapters are used on many Honda and Suzuki models