Bilge Alert High Water Alarm – 12V Sensor
The Johnson Bilge Alert High Water Alarm detects disruptions in a bilge pump from water or other fluids. The alarm is very small, easy to mount, and is held within a sealed case that resists all corrosion or potential damage from oil and debris.
The Johnson Bilge Pump Alert system utilizes a patented Mirus field effect detector cell that produces a micro-electrical field. When activated, the system triggers a 100db piezo alarm and LED light on the control panel. To prevent false alarms, water must disrupt the sensor for 8 seconds before going off. In addition, a 3-way rocker switch allows users to test, arm, and turn off the alarm.
SKU:JOH-72303

![Mopeka PRO+ Bulk Cellular LTE - Cat - M1 f/Over 4' Tall [M1015050]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/mopeka-pro-bulk-cellular-lte-cat-m1-f-over-4-tall-m1015050.webp)
![Mopeka TD40 BLE - LR 4' to 18' Tall - Work w/All Non-Pressurized Fluids [M2012003]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/mopeka-td40-ble-lr-4-to-18-tall-work-w-all-non-pressurized-fluids-m2012003.webp)
![Mopeka PRO+ Residential Cellular LTE - CAT - M1 f/48" Tall Tanks or Less [M1015001]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/mopeka-pro-residential-cellular-lte-cat-m1-f-48-tall-tanks-or-less-m1015001.webp)
![Mopeka PRO+ Residential BLE - LR f/48" Tall Tanks or Less [M1015002]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/mopeka-pro-residential-ble-lr-f-48-tall-tanks-or-less-m1015002.webp)
![Mopeka Pro Check BLE Sensor f/Water w/GreaseMounting Bracket [M1017073]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/mopeka-pro-check-ble-sensor-f-water-w-greasemounting-bracket-m1017073.webp)
![Mopeka TD200 Cellular LTE - Cat - M1 4' Tall or Less - Works w/All Non-Pressurized Fluids [M2012006]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/mopeka-td200-cellular-lte-cat-m1-4-tall-or-less-works-w-all-non-pressurized-flui.webp)
![Mopeka PRO+ Bulk BLE - Long Range f/Over 4' Tall [M1015051]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/mopeka-pro-bulk-ble-long-range-f-over-4-tall-m1015051.webp)
![Mopeka Pro Check Universal for Multiple Liquids Bottom Up Sensor w/Grease3 Spacers [M1017023]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/mopeka-pro-check-universal-multiple-liquids-bottom-up-sensor-w-grease3-spacers-m.webp)