Precise four-channel vacuum indicator designed specifically for intake synchronization of engines with multiple carburetors or throttle bodies (maximum vacuum rating for this tool is 40 cm Hg)Rugged, impact resistant ABS enclosure with convenient storage area for adaptersSpill-proof design means the tool can be stored in a horizontal or vertical positionFor use with any two-, three- or four-cylinder four stroke motorcyclesIncludes hoses, 5 mm adapters, in-line restrictors and instructions5 mm adapters are used on many Honda and Suzuki modelsIncludes hang hook to clip onto the handlebars for easy useRubber feet on enclosure bottom helps prevent slidingEasy to read scale for precise synchronizationUnaffected by ambient pressure changesMercury-free designFor use on many Honda and Suzuki models, most Kawasaki models do not need adapters.