A WASP level switch is a device used to detect the level of liquid in a tank or other container. It typically consists of a probe or float that is activated by the presence of liquid, which then sends a signal to a control system or other device to indicate the level of the liquid. WASP level switches are commonly used in industrial and commercial applications to monitor the level of liquids such as water, oil, and chemicals. They can also be used in water treatment and sewage systems to detect the level of water in a tank or pump station.