The Oxygenator Pro livewell Flush Mount will retrofit most boat livewells from 10 to 20 gallons and operates off the existing boat battery. The Oxygenator manufactures 100% pure oxygen by splitting the hydrogen molecule from the oxygen molecule in water. This creates a super-saturated oxygen environment, even in the warmest water. No switch required, automatically activated when livewell fills with water. Silent running. 12V DC drawing less than 1 Amp.