Attwood S3 Series 12V Automatic Bilge Switch

The Attwood Automatic Bilge Switch S3 Series uses proprietary Electronic Sensing technology to detect bilge water levels and trigger pump activation, engineered to operate consistently in any bilge water mixture without failure.

Because it senses electronically rather than mechanically, the pump isn't exposed to continuous cycling from splashing bilge water, chemicals, sludge buildup, or foam the way a float switch can misread, since the S3 can tell the difference.

Fully sealed electronics keep the switch completely protected from water or chemical exposure, giving reliable long-term operation in a bilge environment that would degrade a less-protected switch. Explore more bilge pump switches and accessories.

• Electronic Sensing technology, not a mechanical float
• Distinguishes splashing, chemicals, sludge, and foam
• Fully sealed electronics
• 12V operation