The Marine Metal Cool Bubbles Air Pump maintains a constant water temperature with proper aeration. It is impact resistant with neoprene seals and waterproof switch. It has special weighted air stones to provide greater dissolved oxygen. The multi-purpose lid has a large opening for easy bait net access, cutting surface, and mounting tabs for tools and tackle. The bucket is designed for both freshwater and saltwater use and ideal for crappie and ice fishing. Each unit is individually tank tested to assure the highest quality and is complete and ready to use.