Attwood® S3 Series Digital Bilge Switch.
Features electronic sensing technology to detect bilge water levels and trigger pump activations. Operating in any bilge water mixture without fail, the S3 Series guarantees that your pump won't be exposed to continuous cycling. That's because the S3 Switch won't be fooled by splashing bilge water, chemicals, sludge build-up or foam.
Switch can be mounted on the floor of the bilge directly to a stringer wall or alongside the basket of the pump without added components or brackets. Compatible with almost all competitive products. Fully sealed electronics are protected from water or chemical damage. No moving parts that can jam up or break over time. 12V. 15A. 36" wire.