This latching air switch was used for two different purposes on Hot Spot spa models. In 1993-1994 is was used as a jet activation switch. In 1995-1998 it was used as a light activation switch. It is connected with a clear vinyl tube to the air button located on the bar top of the Hot Spot models. Once the air button is depressed, a puff of air activates this switch. In turn the switch sends a signal to the circuit board or relay which turns the jet pump onto low speed, then high speed and then off. It also will turn the light on and off on the 1995-1998 Hot Spots.