We use the bell trap system with all our electrical sockets and control equipment, employing an air chamber. 

When the air chamber is in its resting position the underside is open. When the water level rises the underside is sealed off by water, creating an air bubble in the chamber. The air bubble ensures that the connected electrical equipment remains free of water.

In the event of flooding or prolonged rainfall the air bubble in the chamber will still be large enough to keep the equipment dry.

No connection to the drainage system is required.
Our equipment housings are not enclosed at the base so any rainwater sinks away naturally as the water level falls.