Sherlock 5-Second Leak Detectors are used for detecting leaks in pipe joints, tube connections, tanks or any system under gas or air pressure. They are very easy to use, simply wipe surface to be tested with a brush or dauber, squirt on with a squeeze bottle or spray with a trigger sprayer. Small leaks form white foam in 5 to 60 seconds. Large leaks form large bubbles almost instantly. Shipped only in unbreakable containers.