Here's a shot of one of 5 water detectors connected to the WaterBug. It's output connects to a SECU16 input.

A SECU16 output (through the relay board) connects to this home-brew water shutoff. On a detect, the solenoid pulls the pin allowing the main shutoff valve to spring shut.

Another SECU16 output connects to an even larger relay which also drops power to the 1/2 HP in-well pump when water is detected or whenever the alarm system is enabled. This octagon box houses the relay.