Attwood Automatic Float Switch The Automatic Float Switch converts any bilge pump that draws 10 amps or less to fully automatic operation. Because the manual pump may already be installed in a confined area, the switch features a compact, low-profile design. And, it can mount on any surface from horizontal up to a 35 angle. The optional, integral cover dampens bilge sloshing to reduce pump cycling and prevents debris interference. The switch mechanism is completely isolated and sealed to resist moisture, fume-ignition and electrical shock, and contains no harmful mercury or flexing wires. Operates on 6-32 VDC only.