The Penn Plax Action Treasure Chest and Diver Aquarium Ornament is a fun way to liven up your home aquarium. Watch the live action as the treasure chest opens and closes revealing the treasure inside. The floating diver holds on tight with the chain that attaches to the trunk. A steady stream of bubbles rise from the trunk for visual appeal while also providing the necessary oxygen to the tank. This aquarium ornament measures approximately 4 inches in height and can be placed in any size freshwater or saltwater tank. Our Action Air Treasure Chest Aquarium Ornament attaches easily to any 3/16 air tubing line. Simply connect the two lines together and place inside the fish tank. Aquarium ornament is made of quality resin, has a sturdy bottom that keeps it in place, and is safe for fish. Color may vary. Air pump, tubing, and pressure control valve not included.