Whale Pumps - Electric Field Bilge Switch With Time Delay - BE9006. All Whale bilge switches are designed and manufacturers with highest quality at heart. Combine these accessories with your whale bilge pump for a robust bilge system tailored to your vessel.. Features and Benefits. Environmentally friendly - no toxic mercury. Easy to install mounted on either horizontal or vertical surface (e.g.. bulkhead or hull). Suitable for installations where amp draw is up to 15 amps. Compact design. Application. This Whale Electric Field Sensor senses water level and automatically controls a 12 or 24 volt bilge pump. The switch turns on when it senses 51mm (2") water level and turns off when water is below 13mm (1/2"). This product is designed for use in pleasure boat applications, and is not intended to be used in commercial boating applications or for any other use. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or ot