Rule 12V Automatic Bilge Pumps feature computerized operation and do not require a float switch. They have stainless steel shafts, water cooling and a vibration-free centrifugal impeller. The pump will turn on every 2-1/2 minutes to sense for water, and when water is present the pump will run until the water is removed. The strainer bases can be snapped off for cleaning. They can run dry without damage and are non-sparking.