Product Features:High-volume hand-operated pump builds pressure quickly to locate leaksUniversal cooling system adapter replaces more than 20 individual adapters for cars, vans, light- and heavy-duty trucksPatented adapter cam mechanism helps ensure an air-tight seal with radiator and coolant bottle necksCompact one-piece adapter design fits conveniently in tool boxLarge, easy-to-read 2-1/2 In. diameter gauge includes clearly indicated pressure test zones