Periodic checks for leaks in heat exchanger, chiller and condenser tubes is essential to maintain peak performance. The LD-2X2 is the quick, simple and accurate tool for tube leak detection. To operate, insert one detector into each end of the tube to be checked. Pull and hold trigger of one or both guns until the air pressure gauge on the back of the detector stabilizes. Release trigger and observe the air pressure gauge. If the pressure holds, the tube is fine. If the pressure drops, a leak is indicated. LD-2X2 Tube Leak Detector Kit including two pneumatic guns and three seal sets for tubes ", 7/8" and 1" (19.1mm, 22.2mm and 25.4mm) O.D. Features . Visible pressure gauges - convenient . Rugged construction - long life . Multiple seal sizes - versatile . Quick disconnect fittings - no tools required . Compact - easy handling