Water sensor probes can be installed in diesel fuel filter bowls to alert you when water has accumulated in the bowl and it is time to drain.
This kit includes a probe and an in-dash dectection module that has both a light and an audible buzzer alarm.

Can be used with any Racor filter
Includes RK 21069 probe, alarm panel, and various wire splicers for user supplied 18 AWG connecting wires
Red DRAIN lamp (only) illuminates continuously when water is detected (no green power available indicator light)
Buzzer sounds momentarily when water is first detected
Includes initial power-up self diagnosis feature and circuit protection
Dashboard cut-out = 2-1/16"
Do not use in gasoline applications - explosion hazard