As new . Switch is on when float is up. 20 Metre piggy back plug. Worth over $200 sell $100 Cable Float Level Switches have a wide variety of applications. They are used to tell a pump when to turn on or off based on the level of the water in an area. They can be used to protect a pump from running dry, to keep a tank full or to keep a sump or it empty. )You can then simply plug your 240v pump into the piggy back plug.