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Quick and accurate way to locate vehicle noise. Spring diaphragm on end of hose amplifies noise. Includes two hose ends: long rod helps pinpoint noises in hard-to-access areas: short adapter helps locate noise in a broader area of the vehicle.Locates source of engine noise quickly. Listen for trouble by tracing sound of flowing water,oil,gas or steam. Identify piston slap,worn gears,faulty valves,water pump failure,damaged gaskets and defective bearings. Handle is shockproof. Disassembles for storage.